diff --git a/config.js b/config.js
deleted file mode 100644
index 5dd6187..0000000
--- a/config.js
+++ /dev/null
@@ -1,95 +0,0 @@
-System.config({
-  baseURL: "/",
-  defaultJSExtensions: true,
-  transpiler: "babel",
-  babelOptions: {
-    "optional": [
-      "runtime"
-    ]
-  },
-  paths: {
-    "github:*": "jspm_packages/github/*",
-    "npm:*": "jspm_packages/npm/*"
-  },
-  bundles: {
-    "bundle.js": []
-  },
-
-  map: {
-    "babel": "npm:babel-core@5.8.21",
-    "babel-runtime": "npm:babel-runtime@5.8.20",
-    "clipper-lib": "npm:clipper-lib@1.0.0",
-    "core-js": "npm:core-js@0.9.18",
-    "json": "github:systemjs/plugin-json@0.1.0",
-    "nodeca/js-yaml": "github:nodeca/js-yaml@3.3.1",
-    "read-yaml": "npm:read-yaml@1.0.0",
-    "systemjs/plugin-json": "github:systemjs/plugin-json@0.1.0",
-    "three.js": "github:mrdoob/three.js@r72",
-    "github:jspm/nodelibs-assert@0.1.0": {
-      "assert": "npm:assert@1.3.0"
-    },
-    "github:jspm/nodelibs-path@0.1.0": {
-      "path-browserify": "npm:path-browserify@0.0.0"
-    },
-    "github:jspm/nodelibs-process@0.1.1": {
-      "process": "npm:process@0.10.1"
-    },
-    "github:jspm/nodelibs-util@0.1.0": {
-      "util": "npm:util@0.10.3"
-    },
-    "npm:argparse@1.0.2": {
-      "assert": "github:jspm/nodelibs-assert@0.1.0",
-      "fs": "github:jspm/nodelibs-fs@0.1.2",
-      "lodash": "npm:lodash@3.10.1",
-      "path": "github:jspm/nodelibs-path@0.1.0",
-      "process": "github:jspm/nodelibs-process@0.1.1",
-      "sprintf-js": "npm:sprintf-js@1.0.3",
-      "util": "github:jspm/nodelibs-util@0.1.0"
-    },
-    "npm:assert@1.3.0": {
-      "util": "npm:util@0.10.3"
-    },
-    "npm:babel-runtime@5.8.20": {
-      "process": "github:jspm/nodelibs-process@0.1.1"
-    },
-    "npm:clipper-lib@1.0.0": {
-      "process": "github:jspm/nodelibs-process@0.1.1"
-    },
-    "npm:core-js@0.9.18": {
-      "fs": "github:jspm/nodelibs-fs@0.1.2",
-      "process": "github:jspm/nodelibs-process@0.1.1",
-      "systemjs-json": "github:systemjs/plugin-json@0.1.0"
-    },
-    "npm:esprima@2.2.0": {
-      "fs": "github:jspm/nodelibs-fs@0.1.2",
-      "process": "github:jspm/nodelibs-process@0.1.1"
-    },
-    "npm:inherits@2.0.1": {
-      "util": "github:jspm/nodelibs-util@0.1.0"
-    },
-    "npm:js-yaml@3.3.1": {
-      "argparse": "npm:argparse@1.0.2",
-      "esprima": "npm:esprima@2.2.0",
-      "fs": "github:jspm/nodelibs-fs@0.1.2",
-      "path": "github:jspm/nodelibs-path@0.1.0",
-      "process": "github:jspm/nodelibs-process@0.1.1",
-      "systemjs-json": "github:systemjs/plugin-json@0.1.0",
-      "util": "github:jspm/nodelibs-util@0.1.0"
-    },
-    "npm:lodash@3.10.1": {
-      "process": "github:jspm/nodelibs-process@0.1.1"
-    },
-    "npm:path-browserify@0.0.0": {
-      "process": "github:jspm/nodelibs-process@0.1.1"
-    },
-    "npm:read-yaml@1.0.0": {
-      "fs": "github:jspm/nodelibs-fs@0.1.2",
-      "js-yaml": "npm:js-yaml@3.3.1",
-      "xtend": "npm:xtend@4.0.0"
-    },
-    "npm:util@0.10.3": {
-      "inherits": "npm:inherits@2.0.1",
-      "process": "github:jspm/nodelibs-process@0.1.1"
-    }
-  }
-});
diff --git a/example/app.js b/example/app.js
index eaa4bfa..4dfebd0 100644
--- a/example/app.js
+++ b/example/app.js
@@ -1,19 +1,17 @@
 import THREE from 'three.js';
-import PRINTER_SETTINGS from 'settings/printer_settings.json!';
-import USER_SETTINGS from 'settings/user_settings.json!';
 import * as SLICER from 'src/index';
 
-var settings = new SLICER.Settings();
-settings.updateConfig(PRINTER_SETTINGS["ultimaker2go"]);
-settings.updateConfig(USER_SETTINGS);
+const settings = new SLICER.Settings({
+	...SLICER.printerSettings['ultimaker2go'],
+	...SLICER.userSettings
+});
 
-var geometry = new THREE.TorusGeometry(20, 10, 30, 30);
+const geometry = new THREE.TorusGeometry(20, 10, 30, 30);
 
-var slicer = new SLICER.Slicer();
-//var slicer = new SLICER.SlicerWorker();
+const slicer = new SLICER.Slicer();
 
-slicer.setGeometry(geometry.clone());
-slicer.onfinish = function (gCode) {
-	document.getElementById('gcode').innerHTML = gCode.replace(/(?:\r\n|\r|\n)/g, '<br />');
-};
+slicer.setGeometry(geometry);
+slicer.addEventListener('finish', ({ gcode }) => {
+	document.getElementById('gcode').innerHTML = gcode.replace(/(?:\r\n|\r|\n)/g, '<br />');
+});
 slicer.slice(settings);
diff --git a/example/index.html b/example/index.html
index 1117bf4..f85f1ec 100644
--- a/example/index.html
+++ b/example/index.html
@@ -11,7 +11,7 @@
 		</style>
 
 		<script type="text/javascript" src="../jspm_packages/system.js"></script>
-		<script type="text/javascript" src="../config.js"></script>
+		<script type="text/javascript" src="../jspm.config.js"></script>
 
 		<script type="text/javascript">
 			System.import('example/app.js');
@@ -24,4 +24,4 @@
 	<p id="gcode"></p>
 
 	</body>
-</html>
\ No newline at end of file
+</html>
diff --git a/jspm.config.js b/jspm.config.js
new file mode 100644
index 0000000..8856ab1
--- /dev/null
+++ b/jspm.config.js
@@ -0,0 +1,70 @@
+SystemJS.config({
+  paths: {
+    "github:": "jspm_packages/github/",
+    "npm:": "jspm_packages/npm/",
+    "slicer/": "src/"
+  },
+  browserConfig: {
+    "baseURL": "/"
+  },
+  devConfig: {
+    "map": {
+      "babel-runtime": "npm:babel-runtime@5.8.38",
+      "core-js": "npm:core-js@0.9.18",
+      "process": "github:jspm/nodelibs-process@0.2.0-alpha",
+      "fs": "github:jspm/nodelibs-fs@0.2.0-alpha",
+      "plugin-babel": "npm:systemjs-plugin-babel@0.0.12"
+    },
+    "packages": {
+      "npm:babel-runtime@5.8.38": {
+        "map": {}
+      },
+      "npm:core-js@0.9.18": {
+        "map": {
+          "systemjs-json": "github:systemjs/plugin-json@0.1.2"
+        }
+      }
+    }
+  },
+  transpiler: "plugin-babel",
+  babelOptions: {
+    "optional": [
+      "runtime"
+    ]
+  },
+  packages: {
+    "slicer": {
+      "main": "index.js"
+    }
+  },
+  bundles: {
+    "bundle.js": []
+  },
+  map: {
+    "babel": "npm:babel-core@5.8.38"
+  }
+});
+
+SystemJS.config({
+  packageConfigPaths: [
+    "npm:@*/*.json",
+    "npm:*.json",
+    "github:*/*.json"
+  ],
+  map: {
+    "json": "github:systemjs/plugin-json@0.1.2",
+    "Doodle3D/clipper-js": "github:Doodle3D/clipper-js@master",
+    "casperlamboo/EventDispatcher": "github:casperlamboo/EventDispatcher@master",
+    "three.js": "github:mrdoob/three.js@r72"
+  },
+  packages: {
+    "github:Doodle3D/clipper-js@master": {
+      "map": {
+        "clipper-lib": "npm:clipper-lib@1.0.0"
+      }
+    },
+    "npm:clipper-lib@1.0.0": {
+      "map": {}
+    }
+  }
+});
diff --git a/package.json b/package.json
index 1b705de..f8f88fe 100644
--- a/package.json
+++ b/package.json
@@ -1,20 +1,31 @@
 {
   "jspm": {
-    "main": "index",
+    "name": "slicer",
+    "main": "index.js",
     "directories": {
       "lib": "src"
     },
     "dependencies": {
-      "clipper-lib": "npm:clipper-lib@^1.0.0",
-      "nodeca/js-yaml": "github:nodeca/js-yaml@^3.3.1",
-      "read-yaml": "npm:read-yaml@^1.0.0",
-      "systemjs/plugin-json": "github:systemjs/plugin-json@^0.1.0",
+      "Doodle3D/clipper-js": "github:Doodle3D/clipper-js@master",
+      "casperlamboo/EventDispatcher": "github:casperlamboo/EventDispatcher@master",
+      "json": "github:systemjs/plugin-json@^0.1.2",
       "three.js": "github:mrdoob/three.js@r72"
     },
     "devDependencies": {
-      "babel": "npm:babel-core@^5.1.13",
       "babel-runtime": "npm:babel-runtime@^5.1.13",
-      "core-js": "npm:core-js@^0.9.4"
+      "core-js": "npm:core-js@^0.9.4",
+      "fs": "github:jspm/nodelibs-fs@^0.2.0-alpha",
+      "plugin-babel": "npm:systemjs-plugin-babel@^0.0.12",
+      "process": "github:jspm/nodelibs-process@^0.2.0-alpha"
+    },
+    "overrides": {
+      "npm:babel-runtime@5.8.38": {
+        "main": false,
+        "dependencies": {},
+        "optionalDependencies": {
+          "core-js": "^1.2.0"
+        }
+      }
     }
   }
 }
diff --git a/src/constants.js b/src/constants.js
new file mode 100644
index 0000000..630296d
--- /dev/null
+++ b/src/constants.js
@@ -0,0 +1,2 @@
+export const CLEAN_DELTA = 0.01;
+export const PRECISION = 0.01;
diff --git a/src/gcode.js b/src/gcode.js
index fb0320f..66e26ef 100644
--- a/src/gcode.js
+++ b/src/gcode.js
@@ -1,7 +1,16 @@
 import THREE from 'three.js';
 
+const G_COMMAND = 'G';
+const M_COMMAND = 'M';
+const FAN_SPEED = 'S';
+const SPEED = 'F';
+const EXTRUDER = 'E';
+const POSITION_X = 'X';
+const POSITION_Y = 'Y';
+const POSITION_Z = 'Z';
+
 export default class {
-	constructor () {
+	constructor(settings) {
 		this.gcode = '';
 		this.current = {};
 
@@ -10,155 +19,169 @@ export default class {
 		this.isRetracted = false;
 		this.isFanOn = false;
 		this._nozzlePosition = new THREE.Vector2(0, 0);
-	}
-	
-	_addGCode (command) {
-		var str = '';
-		var first = true;
 
-		for (var i in command) {
+		if (settings !== undefined) {
+			this.setSettings(settings);
+		}
+	}
+
+	_addGCode(command) {
+		let str = '';
+		let first = true;
+
+		for (const action in command) {
+			const value = command[action];
+			const currentValue = this.current[action];
 			if (first) {
-				str = i + command[i];
+				str = action + value;
 
 				first = false;
-			}
-			else if (this.current[i] !== command[i]) {
-				str += ' ' + i + command[i];
+			} else if (currentValue !== value) {
+				str += ` ${action}${value}`;
 
-				this.current[i] = command[i];
+				this.current[action] = value;
 			}
 		}
 
-		this.gcode += str + '\n';
+		this.gcode += `${str}\n`;
 	}
-	
-	setSettings (settings) {
+
+	setSettings(settings) {
 		this.settings = settings;
 
 		return this;
 	}
-	
-	turnFanOn (fanSpeed) {
+
+	turnFanOn(fanSpeed) {
 		this.isFanOn = true;
 
-		var gcode = {
-			'M': 106
-		}
-
-		if (fanSpeed !== undefined) {
-			gcode['S'] = fanSpeed;
-		}
+		const gcode = { [M_COMMAND]: 106 }
+		if (fanSpeed !== undefined) gcode[FAN_SPEED] = fanSpeed;
 
 		this._addGCode(gcode);
 
 		return this;
 	}
-	
-	turnFanOff () {
+
+	turnFanOff() {
 		this.isFanOn = false;
 
-		this._addGCode({
-			'M': 107
-		});
+		this._addGCode({ [M_COMMAND]: 107 });
 
 		return this;
 	}
-	
-	moveTo (x, y, layer) {
-		var layerHeight = this.settings.config['layerHeight'];
-		var travelSpeed = this.settings.config['travelSpeed'];
-		
-		var z = (layer + 1) * layerHeight;
-		var speed = travelSpeed * 60;
+
+	moveTo(x, y, layer) {
+		const {
+			layerHeight,
+			travelSpeed
+		} = this.settings.config;
+
+		const z = (layer + 1) * layerHeight;
+		const speed = travelSpeed * 60;
 
 		this._addGCode({
-			'G': 0, 
-			'X': x.toFixed(3), 'Y': y.toFixed(3), 'Z': z.toFixed(3), 
-			'F': speed.toFixed(3)
+			[G_COMMAND]: 0,
+			[POSITION_X]: x.toFixed(3),
+			[POSITION_Y]: y.toFixed(3),
+			[POSITION_Z]: z.toFixed(3),
+			[SPEED]: speed.toFixed(3)
 		});
-		
+
 		this._nozzlePosition.set(x, y);
 
 		return this;
 	}
-	
-	lineTo (x, y, layer, type) {
-		var newNozzlePosition = new THREE.Vector2(x, y);
 
-		var layerHeight = this.settings.config['layerHeight'];
-		var nozzleDiameter = this.settings.config['nozzleDiameter'];
-		var filamentThickness = this.settings.config['filamentThickness'];
-		var travelSpeed = this.settings.config['travelSpeed'];
+	lineTo(x, y, layer, type) {
+		const newNozzlePosition = new THREE.Vector2(x, y);
 
-		var profile = this.settings.config[(this.bottom ? 'bottom' : type)];
+		const {
+			layerHeight,
+			nozzleDiameter,
+			filamentThickness,
+			travelSpeed
+		} = this.settings.config;
 
-		var speed = profile['speed'] * 60;
-		var flowRate = profile['flowRate'];
-		var z = (layer + 1) * layerHeight;
+		const profile = this.settings.config[(this.bottom ? 'bottom' : type)];
 
-		var lineLength = this._nozzlePosition.distanceTo(newNozzlePosition);
+		let {
+			speed,
+			flowRate
+		} = profile;
 
-		var filamentSurfaceArea = Math.pow((filamentThickness / 2), 2) * Math.PI;
+		speed *= 60;
+		const z = (layer + 1) * layerHeight;
+
+		const lineLength = this._nozzlePosition.distanceTo(newNozzlePosition);
+
+		const filamentSurfaceArea = Math.pow((filamentThickness / 2), 2) * Math.PI;
 		this.extruder += lineLength * nozzleDiameter * layerHeight / filamentSurfaceArea * flowRate;
 
 		this._addGCode({
-			'G': 1,
-			'X': x.toFixed(3), 'Y': y.toFixed(3), 'Z': z.toFixed(3), 
-			'F': speed.toFixed(3), 
-			'E': this.extruder.toFixed(3)
+			[G_COMMAND]: 1,
+			[POSITION_X]: x.toFixed(3),
+			[POSITION_Y]: y.toFixed(3),
+			[POSITION_Z]: z.toFixed(3),
+			[SPEED]: speed.toFixed(3),
+			[EXTRUDER]: this.extruder.toFixed(3)
 		});
 
 		this._nozzlePosition.copy(newNozzlePosition);
 
 		return this;
 	}
-	
-	unRetract () {
-		var retractionEnabled = this.settings.config['retractionEnabled'];
-		var retractionMinDistance = this.settings.config['retractionMinDistance'];
-		var retractionSpeed = this.settings.config['retractionSpeed'];
+
+	unRetract() {
+		const {
+			retractionEnabled,
+			retractionMinDistance,
+			retractionSpeed
+		} = this.settings.config;
 
 		if (this.isRetracted && retractionEnabled) {
 			this.isRetracted = false;
 
-			var speed = retractionSpeed * 60;
+			const speed = retractionSpeed * 60;
 
 			if (this.extruder > retractionMinDistance) {
 				this._addGCode({
-					'G': 0, 
-					'E': this.extruder.toFixed(3), 
-					'F': speed.toFixed(3)
+					[G_COMMAND]: 0,
+					[EXTRUDER]: this.extruder.toFixed(3),
+					[SPEED]: speed.toFixed(3)
 				});
 			}
 		}
 
 		return this;
 	}
-	
-	retract () {
-		var retractionAmount = this.settings.config['retractionAmount'];
-		var retractionEnabled = this.settings.config['retractionEnabled'];
-		var retractionMinDistance = this.settings.config['retractionMinDistance'];
-		var retractionSpeed = this.settings.config['retractionSpeed'];
+
+	retract() {
+		const {
+			retractionAmount,
+			retractionEnabled,
+			retractionMinDistance,
+			retractionSpeed
+		} = this.settings.config;
 
 		if (!this.isRetracted && retractionEnabled) {
 			this.isRetracted = true;
-		
-			var speed = retractionSpeed * 60;
+
+			const speed = retractionSpeed * 60;
 
 			if (this.extruder > retractionMinDistance && retractionEnabled) {
 				this._addGCode({
-					'G': 0, 
-					'E': (this.extruder - retractionAmount).toFixed(3), 
-					'F': speed.toFixed(3)
+					[G_COMMAND]: 0,
+					[EXTRUDER]: (this.extruder - retractionAmount).toFixed(3),
+					[SPEED]: speed.toFixed(3)
 				});
 			}
 		}
 
 		return this;
 	}
-	
-	getGCode () {
+
+	getGCode() {
 		return this.settings.startCode() + this.gcode + this.settings.endCode();
 	}
 }
diff --git a/src/getFillTemplate.js b/src/getFillTemplate.js
new file mode 100644
index 0000000..25df1e4
--- /dev/null
+++ b/src/getFillTemplate.js
@@ -0,0 +1,31 @@
+import Shape from 'Doodle3D/clipper-js';
+
+export default function getFillTemplate(bounds, size, even, uneven) {
+  const paths = [];
+
+  const left = Math.floor(bounds.left / size) * size;
+  const right = Math.ceil(bounds.right / size) * size;
+  const top = Math.floor(bounds.top / size) * size;
+  const bottom = Math.ceil(bounds.bottom / size) * size;
+
+  const width = right - left;
+
+  if (even) {
+    for (let y = top; y <= bottom + width; y += size) {
+      paths.push([
+        { x: left, y },
+        { x: right, y: y - width }
+      ]);
+    }
+  }
+  if (uneven) {
+    for (let y = top - width; y <= bottom; y += size) {
+      paths.push([
+        { x: left, y },
+        { x: right, y: y + width }
+      ]);
+    }
+  }
+
+  return new Shape(paths, false, true);
+}
diff --git a/src/index.js b/src/index.js
index 6105f16..c372b7f 100644
--- a/src/index.js
+++ b/src/index.js
@@ -1,10 +1,6 @@
 import Slicer from './slicer.js';
-import SlicerWorker from './slicerworker.js';
 import Settings from './settings.js';
-import ClipperLib from 'clipper-lib';
+import printerSettings from './settings/printer_settings.json!json';
+import userSettings from './settings/user_settings.json!json';
 
-ClipperLib.Error = function (message) {
-	console.error(message);
-};
-
-export {Slicer, SlicerWorker, Settings};
+export { Slicer, Settings, printerSettings, userSettings };
diff --git a/src/paths.js b/src/paths.js
deleted file mode 100644
index f69bbdf..0000000
--- a/src/paths.js
+++ /dev/null
@@ -1,252 +0,0 @@
-import ClipperLib from 'clipper-lib';
-import THREE from 'three.js';
-
-export default class Paths extends Array {
-	constructor (paths = [], closed = true) {
-		super();
-
-		this.setPaths(paths);
-		this.closed = closed;
-	}
-
-	setPaths (paths) {
-		for (var i = 0; i < paths.length; i ++) {
-			var path = paths[i];
-
-			if (path.length > 0) {
-				this.push(path);
-			}
-		}
-
-		return this;
-	}
-
-	_clip (path, type) {
-		var solution = new ClipperLib.PolyTree();
-
-		var clipper = new ClipperLib.Clipper();
-		clipper.AddPaths(this, ClipperLib.PolyType.ptSubject, this.closed);
-		clipper.AddPaths(path, ClipperLib.PolyType.ptClip, path.closed);
-		clipper.Execute(type, solution);
-
-		if (this.closed) {
-			var paths = ClipperLib.Clipper.ClosedPathsFromPolyTree(solution);
-		}
-		else {
-			var paths = ClipperLib.Clipper.OpenPathsFromPolyTree(solution);
-		}
-
-		return new Paths(paths, this.closed);
-	}
-	
-	union (path) {
-		return this._clip(path, ClipperLib.ClipType.ctUnion);
-	}
-
-	difference (path) {
-		return this._clip(path, ClipperLib.ClipType.ctDifference);
-	}
-
-	intersect (path) {
-		return this._clip(path, ClipperLib.ClipType.ctIntersection);
-	}
-
-	xor (path) {
-		return this._clip(path, ClipperLib.ClipType.ctXor);
-	}
-
-	offset (offset) {
-		var solution = new ClipperLib.Paths();
-		var co = new ClipperLib.ClipperOffset(1, 1);
-		co.AddPaths(this, ClipperLib.JoinType.jtSquare, ClipperLib.EndType.etClosedPolygon);
-		co.Execute(solution, offset);
-
-		return new Paths(solution);
-	}
-
-	scaleUp (factor) {
-		ClipperLib.JS.ScaleUpPaths(this, factor);
-
-		return this;
-	}
-
-	scaleDown (factor) {
-		ClipperLib.JS.ScaleDownPaths(this, factor);
-
-		return this;
-	}
-
-	lastPoint () {
-		if (this.length === 0) {
-			return new THREE.Vector2();
-		}
-
-		var lastPath = this[this.length - 1];
-		var lastPoint = this.closed ? lastPath[0] : lastPath[lastPath.length - 1];
-		return new THREE.Vector2(lastPoint.X, lastPoint.Y);
-	}
-
-	optimizePath (start) {
-		var optimizedPaths = new Paths([], this.closed);
-		var donePaths = [];
-
-		while (optimizedPaths.length !== this.length) {
-			var minLength = false;
-			var reverse;
-			var minPath;
-			var offset;
-			var pathIndex;
-
-			for (var i = 0; i < this.length; i += 1) {
-				var path = this[i];
-
-				if (donePaths.indexOf(i) === -1) {
-
-					if (this.closed) {
-						for (var j = 0; j < path.length; j += 1) {
-							var point = new THREE.Vector2(path[j].X, path[j].Y);
-							var length = point.sub(start).length();
-							if (minLength === false || length < minLength) {
-								minPath = path;
-								minLength = length;
-								offset = j;
-								pathIndex = i;
-						  }
-						}
-					}
-					else {
-						var startPoint = new THREE.Vector2(path[0].X, path[0].Y);
-						var length = startPoint.sub(start).length();
-						if (minLength === false || length < minLength) {
-							minPath = path;
-							minLength = length;
-							reverse = false;
-							pathIndex = i;
-						}
-						var endPoint = new THREE.Vector2(path[path.length - 1].X, path[path.length - 1].Y);
-						var length = endPoint.sub(start).length();
-						if (length < minLength) {
-							minPath = path;
-							minLength = length;
-							reverse = true;
-							pathIndex = i;
-						}
-					}
-				}
-			}
-
-			if (this.closed) {
-				minPath = minPath.concat(minPath.splice(0, offset));
-				var point = minPath[0];
-			}
-			else {
-				if (reverse) {
-					minPath.reverse();
-				}
-				var point = minPath[minPath.length - 1];
-			}
-			donePaths.push(pathIndex);
-			start = new THREE.Vector2(point.X, point.Y);
-			
-			optimizedPaths.push(minPath);
-		}
-
-		return optimizedPaths;
-	}
-
-	areas () {
-		var areas = [];
-
-		for (var i = 0; i < this.length; i ++) {
-			var shape = this[i];
-			var area = Math.abs(ClipperLib.Clipper.Area(shape));
-			areas.push(area);
-		}
-
-		return areas;
-	}
-
-	area () {
-		var areas = this.areas();
-		var totalArea = 0;
-
-		for (var i = 0; i < areas.length; i ++) {
-			var area = areas[i];
-			totalArea += area;
-		}
-
-		return totalArea;
-	}
-
-	tresholdArea (minArea) {
-		// code not tested yet
-		for (var i = 0; i < this.length; i ++) {
-			var shape = this[i];
-			var area = ClipperLib.Clipper.Area(shape);
-
-			if (area < minArea) {
-				this.splice(i, 1);
-				i -= 1;
-			}
-		}
-	}
-
-	join (path) {
-		for (var i = 0; i < path.length; i += 1) {
-			this.push(path[i]);
-		}
-
-		return this;
-	}
-
-	clone () {
-		return new Paths(ClipperLib.JS.Clone(this), this.closed);
-	}
-
-	bounds () {
-		return ClipperLib.Clipper.GetBounds(this);
-	}
-
-	clean (cleanDelta) {
-		return new Paths(ClipperLib.Clipper.CleanPolygons(this, cleanDelta), this.closed);
-	}
-
-	isHole () {
-		return !ClipperLib.Clipper.Orientation(this[0]);
-	}
-
-	pointCollision (point) {
-		var collision = ClipperLib.Clipper.PointInPolygon(point, this[0]);
-		return ClipperLib.Clipper.PointInPolygon(point, this[0]);
-	}
-
-	boundSize () {
-		var bounds = this.bounds();
-
-		var width = bounds.right - bounds.left;
-		var height = bounds.bottom - bounds.top;
-
-		return width * height;
-	}
-
-	draw (context, color) {
-		context.strokeStyle = color;
-		for (var i = 0; i < this.length; i += 1) {
-			var shape = this[i];
-
-			// var point = shape[0];
-			// context.fillText(i, point.X*2, point.Y*2);
-
-			context.beginPath();
-			for (var j = 0; j < shape.length; j += 1) {
-				var point = shape[j % shape.length];
-
-				context.lineTo(point.X * 2, point.Y * 2);
-			}
-			if (this.closed) {
-				context.closePath();
-			}
-			context.stroke();
-		}
-	}
-}
diff --git a/src/settings.js b/src/settings.js
index a21971c..33fc821 100644
--- a/src/settings.js
+++ b/src/settings.js
@@ -1,54 +1,49 @@
 export default class {
-	constructor () {
-		this.config = {};
+	constructor(config = {}) {
+		this.config = config;
 	}
-
-	updateConfig (config) {
-		for (var i in config) {
-			this.config[i] = config[i];
-		}
+	updateConfig(config) {
+		this.config = { ...this.config, ...config };
 
 		return this;
 	}
-
-	startCode () {		
-		var gcode = this.config["startCode"];
-
-		gcode = this._subsituteVariables(gcode);
-
+	startCode() {
+		const { startCode } = this.config;
+		const gcode = this._subsituteVariables(startCode);
 		return gcode;
 	}
-
-	endCode () {		
-		var gcode = this.config["endCode"];
-
-		gcode = this._subsituteVariables(gcode);
-
+	endCode() {
+		const { endCode } = this.config;
+		const gcode = this._subsituteVariables(endCode);
 		return gcode;
 	}
+	_subsituteVariables(gcode) {
+		let {
+			temperature,
+			bedTemperature,
+			heatTemperature,
+			heatBedTemperature,
+			travelSpeed,
+			printerType,
+			heatedbed
+		} = this.config;
 
-	_subsituteVariables (gcode) {
-		var temperature = this.config["temperature"];
-		var bedTemperature = this.config["bedTemperature"];
-		var preheatTemperature = this.config["heatupTemperature"];
-		var preheatBedTemperature = this.config["heatupBedTemperature"];
-		var travelSpeed = this.config["travelSpeed"] * 60;
-		var printerType = this.config["type"];
-		var heatedbed = this.config["heatedbed"];
+		travelSpeed *= 60;
 
 		switch (printerType) {
-			case "makerbot_replicator2": printerType = "r2"; break; 
-			case "makerbot_replicator2x": printerType = "r2x"; break;
-			case "makerbot_thingomatic": printerType = "t6"; break;
-			case "makerbot_generic": printerType = "r2"; break;
-			case "_3Dison_plus": printerType = "r2"; break;
+			case 'makerbot_replicator2': printerType = 'r2'; break;
+			case 'makerbot_replicator2x': printerType = 'r2x'; break;
+			case 'makerbot_thingomatic': printerType = 't6'; break;
+			case 'makerbot_generic': printerType = 'r2'; break;
+			case '_3Dison_plus': printerType = 'r2'; break;
 		}
-		var heatedBedReplacement = heatedbed ? "" : ";";
+
+		const heatedBedReplacement = heatedbed ? '' : ';';
 
 		gcode = gcode.replace(/{printingTemp}/gi, temperature);
 		gcode = gcode.replace(/{printingBedTemp}/gi, bedTemperature);
-		gcode = gcode.replace(/{preheatTemp}/gi, preheatTemperature);
-		gcode = gcode.replace(/{preheatBedTemp}/gi, preheatBedTemperature);
+		gcode = gcode.replace(/{preheatTemp}/gi, heatTemperature);
+		gcode = gcode.replace(/{preheatBedTemp}/gi, heatBedTemperature);
 		gcode = gcode.replace(/{printerType}/gi, printerType);
 		gcode = gcode.replace(/{travelSpeed}/gi, travelSpeed);
 		gcode = gcode.replace(/{if heatedBed}/gi, heatedBedReplacement);
diff --git a/settings/printer_settings.json b/src/settings/printer_settings.json
similarity index 100%
rename from settings/printer_settings.json
rename to src/settings/printer_settings.json
diff --git a/settings/user_settings.json b/src/settings/user_settings.json
similarity index 100%
rename from settings/user_settings.json
rename to src/settings/user_settings.json
diff --git a/src/slice.js b/src/slice.js
index c3c13d3..32b75bf 100644
--- a/src/slice.js
+++ b/src/slice.js
@@ -1,134 +1,31 @@
-import Paths from './paths.js';
+import Shape from 'Doodle3D/clipper-js';
 
 export default class {
-	constructor () {
+	constructor() {
 		this.parts = [];
 	}
+	getOutline() {
+		const outLines = new Shape([], true);
 
-	removeSelfIntersect () {
-		for (var i = 0; i < this.parts.length; i ++) {
-			var part1 = this.parts[i].intersect;
+		for (let i = 0; i < this.parts.length; i ++) {
+			const part = this.parts[i];
 
-			if (!part1.closed) {
-				continue;
-			}
-
-			for (var j = i + 1; j < this.parts.length; j ++) {
-				var part2 = this.parts[j].intersect;
-
-				if (!part2.closed) {
-					continue;
-				}
-
-				if (part2.intersect(part1).length > 0) {
-					part1 = this.parts[i].intersect = part1.union(part2);
-
-					this.parts.splice(j, 1);
-					j --;
-				}
-			}
-		}
-	}
-
-	optimizePaths (start) {
-		if (this.brim !== undefined && this.brim.length > 0) {
-			this.brim = this.brim.optimizePath(start);
-			start = this.brim.lastPoint();
-		}
-
-		var parts = [];
-
-		while (this.parts.length > 0) {
-
-			var closestDistance = Infinity;
-			var closestPart;
-
-			for (var i = 0; i < this.parts.length; i ++) {
-				var part = this.parts[i];
-				if (part.intersect.closed) {
-					var bounds = part.outerLine.bounds();
-				}
-				else {
-					var bounds = part.intersect.bounds();
-				}
-
-				var top = bounds.top - start.y;
-				var bottom = start.y - bounds.bottom;
-				var left = bounds.left - start.x;
-				var right = start.x - bounds.right;
-
-				var distance = Math.max(top, bottom, left, right);
-
-				if (distance < closestDistance) {
-					closestDistance = distance;
-					closestPart = i;
-				}
-			}
-
-			var part = this.parts.splice(closestPart, 1)[0];
-			parts.push(part);
-
-			if (part.intersect.closed) {
-				if (part.outerLine.length > 0) {
-					part.outerLine = part.outerLine.optimizePath(start);
-					start = part.outerLine.lastPoint();
-				}
-
-				for (var j = 0; j < part.innerLines.length; j ++) {
-					var innerLine = part.innerLines[j];
-					if (innerLine.length > 0) {
-						part.innerLines[j] = innerLine.optimizePath(start);
-						start = part.innerLines[j].lastPoint();
-					}
-				}
-
-				if (part.fill.length > 0) {
-					part.fill = part.fill.optimizePath(start);
-					start = part.fill.lastPoint();
-				}
-			}
-			else {
-				part.intersect.optimizePath(start);
-				start = part.intersect.lastPoint();
-			}
-
-		}
-
-		this.parts = parts;
-
-		if (this.support !== undefined && this.support.length > 0) {
-			this.support = this.support.optimizePath(start);
-			start = this.support.lastPoint();
-		}
-
-		return start;
-	}
-
-	getOutline () {
-		var outLines = new Paths([], true);
-
-		for (var i = 0; i < this.parts.length; i ++) {
-			var part = this.parts[i];
-
-			if (part.intersect.closed) {
+			if (part.shape.closed) {
 				outLines.join(this.parts[i].outerLine);
 			}
 		}
 
 		return outLines;
 	}
+	add(shape) {
+		const part = { shape };
 
-	add (intersect) {
-		var parts = {
-			intersect
-		};
-
-		if (intersect.closed) {
-			parts.innerLines = [];
-			parts.outerLine = new Paths([], true);
-			parts.fill = new Paths([], false);
+		if (shape.closed) {
+			part.innerLines = [];
+			part.outerLine = new Shape([], true);
+			part.fill = new Shape([], false);
 		}
 
-		this.parts.push(parts);
+		this.parts.push(part);
 	}
-}
\ No newline at end of file
+}
diff --git a/src/sliceActions/addBrim.js b/src/sliceActions/addBrim.js
new file mode 100644
index 0000000..096669e
--- /dev/null
+++ b/src/sliceActions/addBrim.js
@@ -0,0 +1,19 @@
+import THREE from 'three.js';
+import { PRECISION } from '../constants.js';
+
+const offsetOptions = {
+  jointType: 'jtSquare',
+  endType: 'etClosedPolygon',
+  miterLimit: 2.0,
+  roundPrecision: 0.25
+};
+
+export default function addBrim(slices, settings) {
+  console.log('add brim');
+
+  let { brimOffset } = settings.config;
+  brimOffset /= PRECISION;
+
+  const fistLayer = slices[0];
+  fistLayer.brim = fistLayer.getOutline().offset(brimOffset, offsetOptions);
+}
diff --git a/src/sliceActions/applyPrecision.js b/src/sliceActions/applyPrecision.js
new file mode 100644
index 0000000..506431a
--- /dev/null
+++ b/src/sliceActions/applyPrecision.js
@@ -0,0 +1,22 @@
+import { PRECISION } from '../constants.js'
+
+export default function applyPrecision(shapes) {
+  for (let i = 0; i < shapes.length; i ++) {
+    const { closedShapes, openShapes } = shapes[i];
+
+    scaleUpShape(closedShapes);
+    scaleUpShape(openShapes);
+  }
+}
+
+function scaleUpShape(shape) {
+  for (let i = 0; i < shape.length; i ++) {
+      const path = shape[i];
+
+      for (let i = 0; i < path.length; i ++) {
+        const point = path[i];
+
+        point.copy(point.divideScalar(PRECISION));
+      }
+  }
+}
diff --git a/src/sliceActions/calculateLayersIntersections.js b/src/sliceActions/calculateLayersIntersections.js
new file mode 100644
index 0000000..1015aae
--- /dev/null
+++ b/src/sliceActions/calculateLayersIntersections.js
@@ -0,0 +1,47 @@
+import THREE from 'three.js';
+
+export default function calculateLayersIntersections(lines, settings) {
+  console.log('calculating layer intersections');
+
+  const { layerHeight, dimensionsZ } = settings.config;
+
+  const numLayers = Math.floor(dimensionsZ / layerHeight);
+
+  const layerIntersectionIndexes = [];
+  const layerIntersectionPoints = [];
+  for (let layer = 0; layer < numLayers; layer ++) {
+    layerIntersectionIndexes[layer] = [];
+    layerIntersectionPoints[layer] = [];
+  }
+
+  for (let lineIndex = 0; lineIndex < lines.length; lineIndex ++) {
+    const line = lines[lineIndex].line;
+
+    const min = Math.ceil(Math.min(line.start.y, line.end.y) / layerHeight);
+    const max = Math.floor(Math.max(line.start.y, line.end.y) / layerHeight);
+
+    for (let layerIndex = min; layerIndex <= max; layerIndex ++) {
+      if (layerIndex >= 0 && layerIndex < numLayers) {
+
+        layerIntersectionIndexes[layerIndex].push(lineIndex);
+
+        const y = layerIndex * layerHeight;
+        let x, z;
+
+        if (line.start.y === line.end.y) {
+          x = line.start.x;
+          z = line.start.z;
+        }
+        else {
+          const alpha = (y - line.start.y) / (line.end.y - line.start.y);
+          x = line.end.x * alpha + line.start.x * (1 - alpha);
+          z = line.end.z * alpha + line.start.z * (1 - alpha);
+        }
+
+        layerIntersectionPoints[layerIndex][lineIndex] = new THREE.Vector2(z, x);
+      }
+    }
+  }
+
+  return { layerIntersectionIndexes, layerIntersectionPoints };
+}
diff --git a/src/sliceActions/createLines.js b/src/sliceActions/createLines.js
new file mode 100644
index 0000000..6b43817
--- /dev/null
+++ b/src/sliceActions/createLines.js
@@ -0,0 +1,49 @@
+import THREE from 'three.js';
+
+function addLine(geometry, lineLookup, lines, a, b) {
+  const index = lines.length;
+  lineLookup[`${a}_${b}`] = index;
+
+  lines.push({
+    line: new THREE.Line3(geometry.vertices[a], geometry.vertices[b]),
+    connects: [],
+    normals: []
+  });
+
+  return index;
+}
+
+export default function createLines(geometry, settings) {
+  console.log('constructing unique lines from geometry');
+
+  const lines = [];
+  const lineLookup = {};
+
+  for (let i = 0; i < geometry.faces.length; i ++) {
+    const face = geometry.faces[i];
+    if (face.normal.y !== 1 && face.normal.y !== -1) {
+      const normal = new THREE.Vector2(face.normal.z, face.normal.x).normalize();
+
+      const lookupA = lineLookup[`${face.b}_${face.a}`];
+      const lookupB = lineLookup[`${face.c}_${face.b}`];
+      const lookupC = lineLookup[`${face.a}_${face.c}`];
+
+      // only add unique lines
+      // returns index of said line
+      const indexA = lookupA !== undefined ? lookupA : addLine(geometry, lineLookup, lines, face.a, face.b);
+      const indexB = lookupB !== undefined ? lookupB : addLine(geometry, lineLookup, lines, face.b, face.c);
+      const indexC = lookupC !== undefined ? lookupC : addLine(geometry, lineLookup, lines, face.c, face.a);
+
+      // set connecting lines (based on face)
+      lines[indexA].connects.push(indexB, indexC);
+      lines[indexB].connects.push(indexC, indexA);
+      lines[indexC].connects.push(indexA, indexB);
+
+      lines[indexA].normals.push(normal);
+      lines[indexB].normals.push(normal);
+      lines[indexC].normals.push(normal);
+    }
+  }
+
+  return lines;
+}
diff --git a/src/sliceActions/generateInfills.js b/src/sliceActions/generateInfills.js
new file mode 100644
index 0000000..e6bb3fd
--- /dev/null
+++ b/src/sliceActions/generateInfills.js
@@ -0,0 +1,81 @@
+import { PRECISION } from '../constants.js'
+import getFillTemplate from '../getFillTemplate.js';
+import Shape from 'Doodle3D/clipper-js';
+
+export default function generateInfills(slices, settings) {
+  console.log('generating infills');
+
+  let {
+    layerHeight,
+    fillGridSize,
+    bottomThickness,
+    topThickness,
+    nozzleDiameter,
+    infillOverlap
+  } = settings.config;
+
+  fillGridSize /= PRECISION;
+  nozzleDiameter /= PRECISION;
+  infillOverlap /= PRECISION;
+
+  const bottomSkinCount = Math.ceil(bottomThickness/layerHeight);
+  const topSkinCount = Math.ceil(topThickness/layerHeight);
+  const nozzleRadius = nozzleDiameter / 2;
+  const hightemplateSize = Math.sqrt(2 * Math.pow(nozzleDiameter, 2));
+
+  for (let layer = 0; layer < slices.length; layer ++) {
+    const slice = slices[layer];
+
+    let surroundingLayer;
+    if (layer - bottomSkinCount >= 0 && layer + topSkinCount < slices.length) {
+      const downSkin = slices[layer - bottomSkinCount].getOutline();
+      const upSkin = slices[layer + topSkinCount].getOutline();
+      surroundingLayer = upSkin.intersect(downSkin);
+    }
+
+    for (let i = 0; i < slice.parts.length; i ++) {
+      const part = slice.parts[i];
+
+      if (!part.shape.closed) {
+        continue;
+      }
+
+      const outerLine = part.outerLine;
+
+      if (outerLine.paths.length > 0) {
+        const inset = (part.innerLines.length > 0) ? part.innerLines[part.innerLines.length - 1] : outerLine;
+
+        const fillArea = inset.offset(-nozzleRadius);
+        let lowFillArea;
+        let highFillArea;
+        if (surroundingLayer) {
+          highFillArea = fillArea.difference(surroundingLayer);
+
+          if (infillOverlap > 0) {
+            highFillArea = highFillArea.offset(infillOverlap);
+          }
+
+          highFillArea = highFillArea.intersect(fillArea);
+          lowFillArea = fillArea.difference(highFillArea);
+        } else {
+          highFillArea = fillArea;
+        }
+
+        if (lowFillArea && lowFillArea.paths.length > 0) {
+          const bounds = lowFillArea.shapeBounds();
+          const lowFillTemplate = getFillTemplate(bounds, fillGridSize, true, true);
+
+          part.fill.join(lowFillTemplate.intersect(lowFillArea));
+        }
+
+        if (highFillArea.paths.length > 0) {
+          const bounds = highFillArea.shapeBounds();
+          const even = (layer % 2 === 0);
+          const highFillTemplate = getFillTemplate(bounds, hightemplateSize, even, !even);
+
+          part.fill.join(highFillTemplate.intersect(highFillArea));
+        }
+      }
+    }
+  }
+}
diff --git a/src/sliceActions/generateInnerLines.js b/src/sliceActions/generateInnerLines.js
new file mode 100644
index 0000000..bf75a7d
--- /dev/null
+++ b/src/sliceActions/generateInnerLines.js
@@ -0,0 +1,48 @@
+import { PRECISION } from '../constants.js'
+
+const offsetOptions = {
+  jointType: 'jtSquare',
+  endType: 'etClosedPolygon',
+  miterLimit: 2.0,
+  roundPrecision: 0.25
+};
+
+export default function generateInnerLines(slices, settings) {
+  console.log('generating outer lines and inner lines');
+
+  // need to scale up everything because of clipper rounding errors
+  let { layerHeight, nozzleDiameter, shellThickness } = settings.config;
+  nozzleDiameter /= PRECISION;
+  shellThickness /= PRECISION;
+  const nozzleRadius = nozzleDiameter / 2;
+  const shells = Math.round(shellThickness / nozzleDiameter);
+
+  for (let layer = 0; layer < slices.length; layer ++) {
+    const slice = slices[layer];
+
+    for (let i = 0; i < slice.parts.length; i ++) {
+      const part = slice.parts[i];
+
+      if (!part.shape.closed) continue;
+
+      const outerLine = part.shape.offset(-nozzleRadius, offsetOptions);
+
+      if (outerLine.paths.length > 0) {
+        part.outerLine.join(outerLine);
+
+        for (let shell = 1; shell < shells; shell += 1) {
+          const offset = shell * nozzleDiameter;
+
+          const innerLine = outerLine.offset(-offset, offsetOptions);
+
+          if (innerLine.paths.length > 0) {
+            part.innerLines.push(innerLine);
+          }
+          else {
+            break;
+          }
+        }
+      }
+    }
+  }
+}
diff --git a/src/sliceActions/generateSupport.js b/src/sliceActions/generateSupport.js
new file mode 100644
index 0000000..17ca7b3
--- /dev/null
+++ b/src/sliceActions/generateSupport.js
@@ -0,0 +1,77 @@
+import getFillTemplate from '../getFillTemplate.js';
+import Shape from 'Doodle3D/clipper-js';
+import { PRECISION } from '../constants.js';
+
+export default function generateSupport(slices, settings) {
+  console.log('generating support');
+
+  if (!settings.config.supportEnabled) return;
+
+  let {
+    layerHeight,
+    supportGridSize,
+    supportAcceptanceMargin,
+    supportPlateSize: plateSize,
+    supportDistanceY,
+    nozzleDiameter
+  } = settings.config;
+
+  supportGridSize /= PRECISION;
+  supportMargin /= PRECISION;
+  plateSize /= PRECISION;
+  nozzleDiameter /= PRECISION;
+  var supportDistanceLayers = Math.max(Math.ceil(supportDistanceY / layerHeight), 1);
+
+  var supportAreas = new Shape([], true);
+
+  for (var layer = slices.length - 1 - supportDistanceLayers; layer >= 0; layer --) {
+    var currentSlice = slices[layer];
+
+    if (supportAreas.length > 0) {
+
+      if (layer >= supportDistanceLayers) {
+        var sliceSkin = slices[layer - supportDistanceLayers].getOutline();
+        sliceSkin = sliceSkin;
+
+        var supportAreasSlimmed = supportAreas.difference(sliceSkin.offset(supportMargin));
+        if (supportAreasSlimmed.area() < 100.0) {
+          supportAreas = supportAreas.difference(sliceSkin);
+        }
+        else {
+          supportAreas = supportAreasSlimmed;
+        }
+      }
+
+
+      var supportTemplate = getFillTemplate(supportAreas.bounds(), supportGridSize, true, true);
+      var supportFill = supportTemplate.intersect(supportAreas);
+      if (supportFill.length === 0) {
+        currentSlice.support = supportAreas.clone();
+      }
+      else {
+        currentSlice.support = supportFill;
+      }
+    }
+
+    var supportSkin = slices[layer + supportDistanceLayers - 1].getOutline();
+
+    var slice = slices[layer + supportDistanceLayers];
+    for (var i = 0; i < slice.parts.length; i ++) {
+      var slicePart = slice.parts[i];
+
+      if (slicePart.intersect.closed) {
+        var outerLine = slicePart.outerLine;
+      }
+      else {
+        var outerLine = slicePart.intersect.offset(supportAcceptanceMargin);
+      }
+
+      var overlap = supportSkin.offset(supportAcceptanceMargin).intersect(outerLine);
+      var overhang = outerLine.difference(overlap);
+
+      if (overlap.length === 0 || overhang.length > 0) {
+        supportAreas = supportAreas.join(overhang);
+      }
+    }
+  }
+}
diff --git a/src/sliceActions/intersectionsToShapes.js b/src/sliceActions/intersectionsToShapes.js
new file mode 100644
index 0000000..8bada93
--- /dev/null
+++ b/src/sliceActions/intersectionsToShapes.js
@@ -0,0 +1,121 @@
+import THREE from 'three.js';
+import Shape from 'Doodle3D/clipper-js';
+
+export default function intersectionsToShapes(layerIntersectionIndexes, layerIntersectionPoints, lines, settings) {
+  console.log('generating slices');
+
+  const layers = [];
+
+  for (let layer = 1; layer < layerIntersectionIndexes.length; layer ++) {
+    const intersectionIndexes = layerIntersectionIndexes[layer];
+    const intersectionPoints = layerIntersectionPoints[layer];
+
+    if (intersectionIndexes.length === 0) continue;
+
+    const closedShapes = [];
+    const openShapes = [];
+    for (let i = 0; i < intersectionIndexes.length; i ++) {
+      let index = intersectionIndexes[i];
+
+      if (intersectionPoints[index] === undefined) continue;
+
+      const shape = [];
+
+      const firstPoints = [index];
+      let isFirstPoint = true;
+      let closed = false;
+
+      while (index !== -1) {
+        const intersection = intersectionPoints[index];
+        // uppercase X and Y because clipper vector
+        shape.push(intersection);
+
+        delete intersectionPoints[index];
+
+        const connects = lines[index].connects;
+        const faceNormals = lines[index].normals;
+
+        for (let i = 0; i < connects.length; i ++) {
+          index = connects[i];
+
+          if (firstPoints.indexOf(index) !== -1 && shape.length > 2) {
+            closed = true;
+            index = -1;
+            break;
+          }
+
+          // Check if index has an intersection or is already used
+          if (intersectionPoints[index] !== undefined) {
+            const faceNormal = faceNormals[Math.floor(i / 2)];
+
+            const a = new THREE.Vector2(intersection.x, intersection.y);
+            const b = new THREE.Vector2(intersectionPoints[index].x, intersectionPoints[index].y);
+
+            // can't calculate normal between points if distance is smaller as 0.0001
+            if ((faceNormal.x === 0 && faceNormal.y === 0) || a.distanceTo(b) < 0.0001) {
+              if (isFirstPoint) {
+                firstPoints.push(index);
+              }
+
+              delete intersectionPoints[index];
+
+              connects.push(...lines[index].connects);
+              faceNormals.push(...lines[index].normals);
+              index = -1;
+            } else {
+              // make sure the path goes the right direction
+              // THREE.Vector2.normal is not yet implimented
+              // const normal = a.sub(b).normal().normalize();
+              const normal = a.sub(b);
+              normal.set(-normal.y, normal.x).normalize();
+
+              if (normal.dot(faceNormal) > 0) {
+                break;
+              } else {
+                index = -1;
+              }
+            }
+          } else {
+            index = -1;
+          }
+        }
+        isFirstPoint = false;
+      }
+
+      if (!closed) {
+        index = firstPoints[0];
+
+        while (index !== -1) {
+          if (firstPoints.indexOf(index) === -1) {
+            const intersection = intersectionPoints[index];
+            shape.unshift(intersection);
+
+            delete intersectionPoints[index];
+          }
+
+          const connects = lines[index].connects;
+
+          for (let i = 0; i < connects.length; i ++) {
+            index = connects[i];
+
+            if (intersectionPoints[index] !== undefined) {
+              break;
+            } else {
+              index = -1;
+            }
+          }
+        }
+      }
+
+      if (closed) {
+        closedShapes.push(shape);
+      } else {
+        openShapes.push(shape);
+      }
+    }
+
+    layers.push({ closedShapes, openShapes });
+  }
+
+  return layers;
+}
diff --git a/src/sliceActions/optimizePaths.js b/src/sliceActions/optimizePaths.js
new file mode 100644
index 0000000..af7b728
--- /dev/null
+++ b/src/sliceActions/optimizePaths.js
@@ -0,0 +1,152 @@
+import THREE from 'three.js';
+import Shape from 'Doodle3D/clipper-js';
+
+export default function optimizePaths(slices, settings) {
+  console.log('optimize paths');
+
+  const start = new THREE.Vector2(0, 0);
+
+  for (let layer = 0; layer < slices.length; layer ++) {
+    const slice = slices[layer];
+
+    if (slice.brim !== undefined && slice.brim.paths.length > 0) {
+    	slice.brim = optimizeShape(slice.brim, start);
+    	start.copy(slice.brim.lastPoint());
+    }
+
+    const parts = [];
+
+    while (slice.parts.length > 0) {
+    	let closestDistance = Infinity;
+    	let closestPart;
+
+    	for (let i = 0; i < slice.parts.length; i ++) {
+    		const part = slice.parts[i];
+
+        let bounds;
+    		if (part.shape.closed) {
+    			bounds = part.outerLine.shapeBounds();
+    		} else {
+    			bounds = part.shape.shapeBounds();
+    		}
+
+    		const top = bounds.top - start.y;
+    		const bottom = start.y - bounds.bottom;
+    		const left = bounds.left - start.x;
+    		const right = start.x - bounds.right;
+
+    		const distance = Math.max(top, bottom, left, right);
+
+    		if (distance < closestDistance) {
+    			closestDistance = distance;
+    			closestPart = i;
+    		}
+    	}
+
+    	const part = slice.parts.splice(closestPart, 1)[0];
+    	parts.push(part);
+
+    	if (part.shape.closed) {
+    		if (part.outerLine.paths.length > 0) {
+    			part.outerLine = optimizeShape(part.outerLine, start);
+    			start.copy(part.outerLine.lastPoint());
+    		}
+
+    		for (let i = 0; i < part.innerLines.length; i ++) {
+    			const innerLine = part.innerLines[i];
+
+    			if (innerLine.paths.length > 0) {
+    				part.innerLines[i] = optimizeShape(innerLine, start);
+    				start.copy(part.innerLines[i].lastPoint());
+    			}
+    		}
+
+    		if (part.fill.paths.length > 0) {
+    			part.fill = optimizeShape(part.fill, start);
+    			start.copy(part.fill.lastPoint());
+    		}
+    	} else {
+    		part.shape = optimizeShape(part.shape, start);
+    		start.copy(part.shape.lastPoint());
+    	}
+    }
+
+    slice.parts = parts;
+
+    if (slice.support !== undefined && slice.support.length > 0) {
+    	slice.support = optimizeShape(slice.support, start);
+    	start.copy(slice.support.lastPoint());
+    }
+  }
+}
+
+function optimizeShape(shape, start) {
+  start = start.clone();
+
+  const inputPaths = shape.mapToLower();
+  const optimizedPaths = [];
+  const donePaths = [];
+
+  while (optimizedPaths.length !== inputPaths.length) {
+    let minLength = false;
+    let reverse;
+    let minPath;
+    let offset;
+    let pathIndex;
+
+    for (let i = 0; i < inputPaths.length; i ++) {
+      if (donePaths.indexOf(i) !== -1) continue;
+
+      const path = inputPaths[i];
+
+      if (shape.closed) {
+        for (let j = 0; j < path.length; j += 1) {
+          const point = new THREE.Vector2().copy(path[j]);
+          const length = point.sub(start).length();
+          if (minLength === false || length < minLength) {
+            minPath = path;
+            minLength = length;
+            offset = j;
+            pathIndex = i;
+          }
+        }
+      } else {
+        const startPoint = new THREE.Vector2().copy(path[0]);
+        const lengthToStart = startPoint.sub(start).length();
+        if (minLength === false || lengthToStart < minLength) {
+          minPath = path;
+          minLength = lengthToStart;
+          reverse = false;
+          pathIndex = i;
+        }
+
+        const endPoint = new THREE.Vector2().copy(path[path.length - 1]);
+        const lengthToEnd = endPoint.sub(start).length();
+        if (lengthToEnd < minLength) {
+          minPath = path;
+          minLength = lengthToEnd;
+          reverse = true;
+          pathIndex = i;
+        }
+      }
+    }
+
+    let point;
+    if (shape.closed) {
+      minPath = minPath.concat(minPath.splice(0, offset));
+      point = minPath[0];
+    } else {
+      if (reverse) {
+        minPath.reverse();
+      }
+      point = minPath[minPath.length - 1];
+    }
+
+    donePaths.push(pathIndex);
+    start.copy(point);
+
+    optimizedPaths.push(minPath);
+  }
+
+  return new Shape(optimizedPaths, shape.closed, true);
+}
diff --git a/src/sliceActions/removePrecision.js b/src/sliceActions/removePrecision.js
new file mode 100644
index 0000000..d1841e9
--- /dev/null
+++ b/src/sliceActions/removePrecision.js
@@ -0,0 +1,32 @@
+import THREE from 'three.js';
+import { PRECISION } from '../constants.js';
+
+export default function removePrecision(slices) {
+  console.log('remove precision');
+
+  const start = new THREE.Vector2(0, 0);
+
+  for (let layer = 0; layer < slices.length; layer ++) {
+    const slice = slices[layer];
+
+    for (let i = 0; i < slice.parts.length; i ++) {
+      const part = slice.parts[i];
+
+      if (part.shape.closed) {
+        part.outerLine.scaleDown(1 / PRECISION);
+        for (let i = 0; i < part.innerLines.length; i ++) {
+          const innerLine = part.innerLines[i];
+          innerLine.scaleDown(1 / PRECISION);
+        }
+        part.fill.scaleDown(1 / PRECISION);
+      }
+    }
+
+    if (slice.support !== undefined) {
+      slice.support.scaleDown(1 / PRECISION);
+    }
+    if (slice.brim !== undefined) {
+      slice.brim.scaleDown(1 / PRECISION);
+    }
+  }
+}
diff --git a/src/sliceActions/shapesToSlices.js b/src/sliceActions/shapesToSlices.js
new file mode 100644
index 0000000..7be4a88
--- /dev/null
+++ b/src/sliceActions/shapesToSlices.js
@@ -0,0 +1,40 @@
+import Shape from 'Doodle3D/clipper-js';
+import Slice from '../slice.js';
+
+import { CLEAN_DELTA } from '../constants.js';
+
+export default function shapesToSlices(shapes, settings) {
+  const sliceLayers = [];
+
+  for (let layer = 0; layer < shapes.length; layer ++) {
+    let { closedShapes, openShapes } = shapes[layer];
+
+    closedShapes = new Shape(closedShapes, true, true)
+      .clean(CLEAN_DELTA)
+      .fixOrientation()
+      .removeOverlap()
+      .seperateShapes();
+
+    openShapes = new Shape(openShapes, false, true)
+      .clean(CLEAN_DELTA);
+
+    const slice = new Slice();
+
+    for (let i = 0; i < closedShapes.length; i ++) {
+      const closedShape = closedShapes[i];
+      slice.add(closedShape);
+
+      // if (openShapes.path.length > 0) {
+      //   openShapes = openShapes.difference(closedShape);
+      // }
+    }
+
+    if (openShapes.paths.length > 0) {
+      slice.add(openShapes);
+    }
+
+    sliceLayers.push(slice);
+  }
+
+  return sliceLayers;
+}
diff --git a/src/sliceActions/slicesToGCode.js b/src/sliceActions/slicesToGCode.js
new file mode 100644
index 0000000..cfa6f5e
--- /dev/null
+++ b/src/sliceActions/slicesToGCode.js
@@ -0,0 +1,71 @@
+import GCode from '../gcode.js';
+
+export default function slicesToGCode(slices, settings) {
+  console.log('slices to gcode');
+
+  const gcode = new GCode(settings);
+
+  for (let layer = 0; layer < slices.length; layer ++) {
+    const slice = slices[layer];
+
+    if (layer === 1) {
+      gcode.turnFanOn();
+      gcode.bottom = false;
+    }
+
+    if (slice.brim !== undefined) {
+      pathToGCode(gcode, slice.brim, true, true, layer, 'brim');
+    }
+
+    for (let i = 0; i < slice.parts.length; i ++) {
+      const part = slice.parts[i];
+
+      if (part.shape.closed) {
+        pathToGCode(gcode, part.outerLine, false, true, layer, 'outerLine');
+
+        for (let i = 0; i < part.innerLines.length; i ++) {
+          const innerLine = part.innerLines[i];
+          pathToGCode(gcode, innerLine, false, false, layer, 'innerLine');
+        }
+
+        pathToGCode(gcode, part.fill, true, false, layer, 'fill');
+      } else {
+        const retract = !(slice.parts.length === 1 && slice.support === undefined);
+        pathToGCode(gcode, part.shape, retract, retract, layer, 'outerLine');
+      }
+    }
+
+    if (slice.support !== undefined) {
+      pathToGCode(gcode, slice.support, true, true, layer, 'support');
+    }
+  }
+
+  return gcode.getGCode();
+}
+
+function pathToGCode(gcode, shape, retract, unRetract, layer, type) {
+  for (let i = 0; i < shape.paths.length; i ++) {
+    const line = shape.paths[i];
+
+    const length = shape.closed ? (line.length + 1) : line.length;
+    for (let i = 0; i < length; i ++) {
+      const point = line[i % line.length];
+
+      if (i === 0) {
+        // TODO
+        // moveTo should impliment combing
+        gcode.moveTo(point.X, point.Y, layer);
+
+        if (unRetract) {
+          gcode.unRetract();
+        }
+      } else {
+        gcode.lineTo(point.X, point.Y, layer, type);
+      }
+    }
+  }
+
+  if (retract) {
+    gcode.retract();
+  }
+}
diff --git a/src/slicer.js b/src/slicer.js
index e0d0dec..ea2b8e0 100644
--- a/src/slicer.js
+++ b/src/slicer.js
@@ -1,41 +1,33 @@
 import THREE from 'three.js';
-import Paths from './paths.js';
-import Slice from './slice.js';
-import GCode from './gcode.js';
+import EventDispatcher from 'casperlamboo/EventDispatcher';
+import calculateLayersIntersections from './sliceActions/calculateLayersIntersections.js';
+import createLines from './sliceActions/createLines.js';
+import generateInfills from './sliceActions/generateInfills.js';
+import generateInnerLines from './sliceActions/generateInnerLines.js';
+import generateSupport from './sliceActions/generateSupport.js';
+import intersectionsToShapes from './sliceActions/intersectionsToShapes.js';
+import addBrim from './sliceActions/addBrim.js';
+import optimizePaths from './sliceActions/optimizePaths.js';
+import shapesToSlices from './sliceActions/shapesToSlices.js';
+import slicesToGCode from './sliceActions/slicesToGCode.js';
+import applyPrecision from './sliceActions/applyPrecision.js';
+import removePrecision from './sliceActions/removePrecision.js';
 
-export default class {
-	constructor () {
-		this.progress = {
-			createdLines: false, 
-			calculatedLayerIntersections: false, 
-			sliced: false, 
-			generatedSlices: false, 
-			generatedInnerLines: false, 
-			generatedInfills: false, 
-			generatedSupport: false, 
-			optimizedPaths: false,  
-			generatedGCode: false
-		};
-	}
-
-	setMesh (mesh) {
+export default class extends EventDispatcher {
+	setMesh(mesh) {
 		mesh.updateMatrix();
 
 		this.setGeometry(mesh.geometry, mesh.matrix);
 
 		return this;
 	}
-
-	setGeometry (geometry, matrix) {
-		if (geometry.type === 'BufferGeometry') {
+	setGeometry(geometry, matrix) {
+		if (geometry instanceof THREE.BufferGeometry) {
 			geometry = new THREE.Geometry().fromBufferGeometry(geometry);
-		}
-		else if (geometry.type.endsWith('Geometry')) {
+		} else if (geometry instanceof THREE.Geometry) {
 			geometry = geometry.clone();
-		}
-		else {
-			console.warn('Geometry is not an instance of BufferGeometry or Geometry');
-			return;
+		} else {
+			throw 'Geometry is not an instance of BufferGeometry or Geometry';
 		}
 
 		if (matrix instanceof THREE.Matrix4) {
@@ -49,711 +41,31 @@ export default class {
 
 		return this;
 	}
-
-	slice (settings) {
-		var supportEnabled = settings.config['supportEnabled'];
-
+	slice(settings) {
 		// get unique lines from geometry;
-		var lines = this._createLines(settings);
+		const lines = createLines(this.geometry, settings);
 
-		var {layerIntersectionIndexes, layerIntersectionPoints} = this._calculateLayersIntersections(lines, settings);
+		const {
+			layerIntersectionIndexes,
+			layerIntersectionPoints
+		} = calculateLayersIntersections(lines, settings);
 
-		var shapes = this._intersectionsToShapes(layerIntersectionIndexes, layerIntersectionPoints, lines, settings);
+		const shapes = intersectionsToShapes(layerIntersectionIndexes, layerIntersectionPoints, lines, settings);
 
-		var slices = this._shapesToSlices(shapes, settings);
+		applyPrecision(shapes);
 
-		this._generateInnerLines(slices, settings);
-		
-		this._generateInfills(slices, settings);
-		
-		if (supportEnabled) {
-			this._generateSupport(slices, settings);
-		}
-		
-		this._optimizePaths(slices, settings);
+		const slices = shapesToSlices(shapes, settings);
 
-		var gcode = this._slicesToGCode(slices, settings);
+		generateInnerLines(slices, settings);
+		generateInfills(slices, settings);
+		generateSupport(slices, settings);
+		addBrim(slices, settings);
+		optimizePaths(slices, settings);
+		removePrecision(slices);
 
-		if (this.onfinish !== undefined) {
-			this.onfinish(gcode);
-		}
+		const gcode = slicesToGCode(slices, settings);
 
+		this.dispatchEvent({ type: 'finish', gcode });
 		return gcode;
 	}
-
-	_createLines (settings) {
-		console.log('constructing unique lines from geometry');
-
-		var lines = [];
-		var lineLookup = {};
-
-		var addLine = (a, b) => {
-			var index = lineLookup[b + '_' + a];
-
-			if (index === undefined) {
-				index = lines.length;
-				lineLookup[a + '_' + b] = index;
-
-				lines.push({
-					line: new THREE.Line3(this.geometry.vertices[a], this.geometry.vertices[b]), 
-					connects: [], 
-					normals: []
-				});
-			}
-
-			return index;
-		}
-
-		for (var i = 0; i < this.geometry.faces.length; i ++) {
-			var face = this.geometry.faces[i];
-			if (face.normal.y !== 1 && face.normal.y !== -1) {
-				var normal = new THREE.Vector2(face.normal.z, face.normal.x).normalize();
-
-				// check for only adding unique lines
-				// returns index of said line
-				var a = addLine(face.a, face.b);
-				var b = addLine(face.b, face.c);
-				var c = addLine(face.c, face.a);
-
-				// set connecting lines (based on face)
-				lines[a].connects.push(b, c);
-				lines[b].connects.push(c, a);
-				lines[c].connects.push(a, b);
-
-				lines[a].normals.push(normal);
-				lines[b].normals.push(normal);
-				lines[c].normals.push(normal);
-			}
-		}
-
-		this.progress.createdLines = true;
-		this._updateProgress(settings);
-
-		return lines;
-	}
-
-	_calculateLayersIntersections (lines, settings) {
-		console.log('calculating layer intersections');
-
-		var layerHeight = settings.config["layerHeight"];
-		var height = settings.config["dimensionsZ"];
-
-		var numLayers = Math.floor(height / layerHeight);
-
-		var layerIntersectionIndexes = [];
-		var layerIntersectionPoints = [];
-		for (var layer = 0; layer < numLayers; layer ++) {
-			layerIntersectionIndexes[layer] = [];
-			layerIntersectionPoints[layer] = [];
-		}
-
-		for (var lineIndex = 0; lineIndex < lines.length; lineIndex ++) {
-			var line = lines[lineIndex].line;
-
-			var min = Math.ceil(Math.min(line.start.y, line.end.y) / layerHeight);
-			var max = Math.floor(Math.max(line.start.y, line.end.y) / layerHeight);
-
-			for (var layerIndex = min; layerIndex <= max; layerIndex ++) {
-				if (layerIndex >= 0 && layerIndex < numLayers) {
-
-					layerIntersectionIndexes[layerIndex].push(lineIndex);
-
-					var y = layerIndex * layerHeight;
-
-					if (line.start.y === line.end.y) {
-						var x = line.start.x;
-						var z = line.start.z;
-					}
-					else {
-						var alpha = (y - line.start.y) / (line.end.y - line.start.y);
-						var x = line.end.x * alpha + line.start.x * (1 - alpha);
-						var z = line.end.z * alpha + line.start.z * (1 - alpha);
-					}
-
-					layerIntersectionPoints[layerIndex][lineIndex] = new THREE.Vector2(z, x);
-				}
-			}
-		}
-
-		this.progress.calculatedLayerIntersections = true;
-		this._updateProgress(settings);
-
-		return {
-			layerIntersectionIndexes, 
-			layerIntersectionPoints
-		};
-	}
-
-	_intersectionsToShapes (layerIntersectionIndexes, layerIntersectionPoints, lines, settings) {
-		console.log("generating slices");
-
-		var shapes = [];
-
-		for (var layer = 1; layer < layerIntersectionIndexes.length; layer ++) {
-			var intersectionIndexes = layerIntersectionIndexes[layer];
-			var intersectionPoints = layerIntersectionPoints[layer];
-
-			if (intersectionIndexes.length === 0) {
-				continue;
-			}
-
-			var shapeParts = [];
-			for (var i = 0; i < intersectionIndexes.length; i ++) {
-				var index = intersectionIndexes[i];
-
-				if (intersectionPoints[index] === undefined) {
-					continue;
-				}
-
-				var firstPoints = [index];
-				var isFirstPoint = true;
-				var closed = false;
-
-				var shape = [];
-
-				while (index !== -1) {
-					var intersection = intersectionPoints[index];
-					// uppercase X and Y because clipper vector
-					shape.push({X: intersection.x, Y: intersection.y});
-
-					delete intersectionPoints[index];
-
-					var connects = lines[index].connects;
-					var faceNormals = lines[index].normals;
-
-					for (var j = 0; j < connects.length; j ++) {
-						var index = connects[j];
-
-						if (firstPoints.indexOf(index) !== -1 && shape.length > 2) {
-							closed = true;
-							index = -1;
-							break;
-						}
-
-						// Check if index has an intersection or is already used
-						if (intersectionPoints[index] !== undefined) {
-							var faceNormal = faceNormals[Math.floor(j / 2)];
-
-							var a = new THREE.Vector2(intersection.x, intersection.y);
-							var b = new THREE.Vector2(intersectionPoints[index].x, intersectionPoints[index].y);
-
-							// can't calculate normal between points if distance is smaller as 0.0001
-							if ((faceNormal.x === 0 && faceNormal.y === 0) || a.distanceTo(b) < 0.0001) {
-								if (isFirstPoint) {
-									firstPoints.push(index);
-								}
-
-								delete intersectionPoints[index];
-
-								connects = connects.concat(lines[index].connects);
-								faceNormals = faceNormals.concat(lines[index].normals);
-								index = -1;
-							}
-							else {
-								// make sure the path goes the right direction
-								// THREE.Vector2.normal is not yet implimented
-								// var normal = a.sub(b).normal().normalize();
-								var normal = a.sub(b);
-								normal.set(-normal.y, normal.x).normalize();
-
-								if (normal.dot(faceNormal) > 0) {
-									break;
-								}
-								else {
-									index = -1;
-								}
-							}
-						}
-						else {
-							index = -1;
-						}
-					}
-					isFirstPoint = false;
-				}
-
-				if (!closed) {
-					var index = firstPoints[0];
-
-					while (index !== -1) {
-						if (firstPoints.indexOf(index) === -1) {
-							var intersection = intersectionPoints[index];
-							shape.unshift({X: intersection.x, Y: intersection.y});
-
-							delete intersectionPoints[index];
-						}
-
-						var connects = lines[index].connects;
-
-						for (var i = 0; i < connects.length; i ++) {
-							var index = connects[i];
-
-							if (intersectionPoints[index] !== undefined) {
-								break;
-							}
-							else {
-								index = -1;
-							}
-						}
-					}
-				}
-
-				var part = new Paths([shape], closed).clean(0.01);
-				if (part.length > 0) {
-					shapeParts.push(part);
-				}
-			}
-
-			shapes.push(shapeParts);
-		}
-
-		this.progress.sliced = true;
-		this._updateProgress(settings);
-
-		return shapes;
-	}
-
-	_shapesToSlices (shapes, settings) {
-		var slices = [];
-
-		for (var layer = 0; layer < shapes.length; layer ++) {
-			var shapeParts = shapes[layer];
-
-			var slice = new Slice();
-
-			var holes = [];
-			var outlines = [];
-
-			for (var i = 0; i < shapeParts.length; i ++) {
-				var shape = shapeParts[i];
-
-				if (!shape.closed) {
-					slice.add(shape);
-				}
-				else if (shape.isHole()) {
-					holes.push(shape);
-				}
-				else {
-					slice.add(shape);
-					outlines.push(shape);
-				}
-			}
-
-			outlines.sort((a, b) => {
-				return a.boundSize() - b.boundSize();
-			});
-
-			console.log('test');
-
-			if (holes.length > outlines.length) {
-				[holes, outlines] = [outlines, holes];
-			}
-			else if (holes.length === outlines.length) {
-				holes.sort((a, b) => {
-					return a.boundSize() - b.boundSize();
-				});
-
-				if (holes[0].boundSize > outlines[0].boundSize()) {
-					[holes, outlines] = [outlines, holes];
-				}
-			}
-
-			for (var i = 0; i < holes.length; i ++) {
-				var hole = holes[i];
-
-				for (var j = 0; j < outlines.length; j ++) {
-					var outline = outlines[j];
-
-					if (outline.pointCollision(hole[0][0])) {
-						outline.join(hole);
-						break;
-					}
-				}
-			}
-
-			slice.removeSelfIntersect();
-
-			slices.push(slice);
-		}
-
-		this.progress.generatedSlices = true;
-		this._updateProgress(settings);
-
-		return slices;
-	}
-
-	_generateInnerLines (slices, settings) {
-		console.log("generating outer lines and inner lines");
-
-		// need to scale up everything because of clipper rounding errors
-		var scale = 100;
-
-		var layerHeight = settings.config["layerHeight"];
-		var nozzleDiameter = settings.config["nozzleDiameter"] * scale;
-		var shellThickness = settings.config["shellThickness"] * scale;
-		var nozzleRadius = nozzleDiameter / 2;
-		var shells = Math.round(shellThickness / nozzleDiameter);
-
-		for (var layer = 0; layer < slices.length; layer ++) {
-			var slice = slices[layer];
-
-			for (var i = 0; i < slice.parts.length; i ++) {
-				var part = slice.parts[i];
-
-				if (!part.intersect.closed) {
-					continue;
-				}
-
-				// var outerLine = part.intersect.clone().scaleUp(scale).offset(-nozzleRadius);
-				var outerLine = part.intersect.scaleUp(scale).offset(-nozzleRadius);
-
-				if (outerLine.length > 0) {
-					part.outerLine = outerLine;
-
-					for (var shell = 1; shell < shells; shell += 1) {
-						var offset = shell * nozzleDiameter;
-
-						var innerLine = outerLine.offset(-offset);
-
-						if (innerLine.length > 0) {
-							part.innerLines.push(innerLine);
-						}
-						else {
-							break;
-						}
-					}
-				}
-			}
-		}
-
-		this.progress.generatedInnerLines = true;
-		this._updateProgress(settings);
-	}
-
-	_generateInfills (slices, settings) {
-		console.log("generating infills");
-
-		// need to scale up everything because of clipper rounding errors
-		var scale = 100;
-
-		var layerHeight = settings.config["layerHeight"];
-		var fillGridSize = settings.config["fillGridSize"] * scale;
-		var bottomThickness = settings.config["bottomThickness"];
-		var topThickness = settings.config["topThickness"];
-		var nozzleDiameter = settings.config["nozzleDiameter"] * scale;
-		var infillOverlap = settings.config["infillOverlap"] * scale;
-		
-		var bottomSkinCount = Math.ceil(bottomThickness/layerHeight);
-		var topSkinCount = Math.ceil(topThickness/layerHeight);
-		var nozzleRadius = nozzleDiameter / 2;
-		var hightemplateSize = Math.sqrt(2 * Math.pow(nozzleDiameter, 2));
-
-		for (var layer = 0; layer < slices.length; layer ++) {
-			var slice = slices[layer];
-
-			if (layer - bottomSkinCount >= 0 && layer + topSkinCount < slices.length) {
-				var downSkin =  slices[layer - bottomSkinCount].getOutline();
-				var upSkin = slices[layer + topSkinCount].getOutline();
-				var surroundingLayer = upSkin.intersect(downSkin);
-			}
-			else {
-				var surroundingLayer = false;
-			}		
-
-			for (var i = 0; i < slice.parts.length; i ++) {
-				var part = slice.parts[i];
-
-				if (!part.intersect.closed) {
-					continue;
-				}
-
-				var outerLine = part.outerLine;
-
-				if (outerLine.length > 0) {
-					var inset = (part.innerLines.length > 0) ? part.innerLines[part.innerLines.length - 1] : outerLine;
-
-					var fillArea = inset.offset(-nozzleRadius);
-					var lowFillArea = false;
-					if (surroundingLayer) {
-						var highFillArea = fillArea.difference(surroundingLayer);
-
-						if (infillOverlap > 0) {
-							highFillArea = highFillArea.offset(infillOverlap);
-						}
-
-						highFillArea = highFillArea.intersect(fillArea);
-
-						var lowFillArea = fillArea.difference(highFillArea);
-					}
-					else {
-						var highFillArea = fillArea;
-					}
-
-					var fill = new Paths([], false);
-
-					if (lowFillArea && lowFillArea.length > 0) {
-						var bounds = lowFillArea.bounds();
-						var lowFillTemplate = this._getFillTemplate(bounds, fillGridSize, true, true);
-
-						part.fill.join(lowFillTemplate.intersect(lowFillArea));
-					}
-
-					if (highFillArea.length > 0) {
-						var bounds = highFillArea.bounds();
-						var even = (layer % 2 === 0);
-						var highFillTemplate = this._getFillTemplate(bounds, hightemplateSize, even, !even);
-
-						part.fill.join(highFillTemplate.intersect(highFillArea));
-					}
-				}
-			}
-		}
-
-		this.progress.generatedInfills = true;
-		this._updateProgress(settings);
-	}
-
-	_generateSupport (slices, settings) {
-		console.log("generating support");
-
-		// need to scale up everything because of clipper rounding errors
-		var scale = 100;
-
-		var layerHeight = settings.config["layerHeight"];
-		var supportGridSize = settings.config["supportGridSize"] * scale;
-		var supportAcceptanceMargin = settings.config["supportAcceptanceMargin"] * scale;
-		var supportMargin = settings.config["supportMargin"] * scale;
-		var plateSize = settings.config["supportPlateSize"] * scale;
-		var supportDistanceY = settings.config["supportDistanceY"];
-		var supportDistanceLayers = Math.max(Math.ceil(supportDistanceY / layerHeight), 1);
-		var nozzleDiameter = settings.config["nozzleDiameter"] * scale;
-
-		var supportAreas = new Paths([], true);
-
-		for (var layer = slices.length - 1 - supportDistanceLayers; layer >= 0; layer --) {
-			var currentSlice = slices[layer];
-
-			if (supportAreas.length > 0) {
-
-				if (layer >= supportDistanceLayers) {
-					var sliceSkin = slices[layer - supportDistanceLayers].getOutline();
-					sliceSkin = sliceSkin;
-
-					var supportAreasSlimmed = supportAreas.difference(sliceSkin.offset(supportMargin));
-					if (supportAreasSlimmed.area() < 100.0) {
-						supportAreas = supportAreas.difference(sliceSkin);
-					}
-					else {
-						supportAreas = supportAreasSlimmed;
-					}
-				}
-
-				
-				var supportTemplate = this._getFillTemplate(supportAreas.bounds(), supportGridSize, true, true);
-				var supportFill = supportTemplate.intersect(supportAreas);
-				if (supportFill.length === 0) {
-					currentSlice.support = supportAreas.clone();
-				}
-				else {
-					currentSlice.support = supportFill;
-				}
-			}
-
-			var supportSkin = slices[layer + supportDistanceLayers - 1].getOutline();
-
-			var slice = slices[layer + supportDistanceLayers];
-			for (var i = 0; i < slice.parts.length; i ++) {
-				var slicePart = slice.parts[i];
-
-				if (slicePart.intersect.closed) {
-					var outerLine = slicePart.outerLine;
-				}
-				else {
-					var outerLine = slicePart.intersect.offset(supportAcceptanceMargin);
-				}
-
-				var overlap = supportSkin.offset(supportAcceptanceMargin).intersect(outerLine);
-				var overhang = outerLine.difference(overlap);
-
-				if (overlap.length === 0 || overhang.length > 0) {
-					supportAreas = supportAreas.join(overhang);
-				}
-			}
-		}
-
-		this.progress.generatedSupport = true;
-		this._updateProgress(settings);
-	}
-
-	_optimizePaths (slices, settings) {
-		console.log("opimize paths");
-
-		// need to scale up everything because of clipper rounding errors
-		var scale = 100;
-
-		var brimOffset = settings.config["brimOffset"] * scale;
-
-		var start = new THREE.Vector2(0, 0);
-
-		for (var layer = 0; layer < slices.length; layer ++) {
-			var slice = slices[layer];
-
-			if (layer === 0) {
-				slice.brim = slice.getOutline().offset(brimOffset);
-			}
-
-			start = slice.optimizePaths(start);
-
-			for (var i = 0; i < slice.parts.length; i ++) {
-				var part = slice.parts[i];
-
-				if (part.intersect.closed) {
-					part.outerLine.scaleDown(scale);
-					for (var j = 0; j < part.innerLines.length; j ++) {
-						var innerLine = part.innerLines[j];
-						innerLine.scaleDown(scale);
-					}
-					part.fill.scaleDown(scale);
-				}
-			}
-
-			if (slice.support !== undefined) {
-				slice.support.scaleDown(scale);
-			}
-			if (slice.brim !== undefined) {
-				slice.brim.scaleDown(scale);
-			}
-		}
-
-		this.progress.optimizedPaths = true;
-		this._updateProgress(settings);
-	}
-
-	_getFillTemplate (bounds, size, even, uneven) {
-		var paths = new Paths([], false);
-
-		var left = Math.floor(bounds.left / size) * size;
-		var right = Math.ceil(bounds.right / size) * size;
-		var top = Math.floor(bounds.top / size) * size;
-		var bottom = Math.ceil(bounds.bottom / size) * size;
-
-		var width = right - left;
-
-		if (even) {
-			for (var y = top; y <= bottom + width; y += size) {
-				paths.push([
-					{X: left, Y: y}, 
-					{X: right, Y: y - width}
-				]);
-			}
-		}
-		if (uneven) {
-			for (var y = top - width; y <= bottom; y += size) {
-				paths.push([
-					{X: left, Y: y}, 
-					{X: right, Y: y + width}
-				]);
-			}
-		}
-		
-		return paths;
-	}
-
-	_slicesToGCode (slices, settings) {
-		var gcode = new GCode().setSettings(settings);
-
-		function pathToGCode (path, retract, unRetract, type) {
-
-			for (var i = 0; i < path.length; i ++) {
-				var shape = path[i];
-
-				var length = path.closed ? (shape.length + 1) : shape.length;
-
-				for (var j = 0; j < length; j ++) {
-					var point = shape[j % shape.length];
-
-					if (j === 0) {
-						// TODO
-						// moveTo should impliment combing
-						gcode.moveTo(point.X, point.Y, layer);
-
-						if (unRetract) {
-							gcode.unRetract();
-						}
-					}
-					else {
-						gcode.lineTo(point.X, point.Y, layer, type);
-					}
-				}
-			}
-			
-			if (retract) {
-				gcode.retract();
-			}
-		}
-
-		for (var layer = 0; layer < slices.length; layer ++) {
-			var slice = slices[layer];
-
-			if (layer === 1) {
-				gcode.turnFanOn();
-				gcode.bottom = false;
-			}
-
-			if (slice.brim !== undefined) {
-				pathToGCode(slice.brim, true, true, "brim");
-			}
-
-			for (var i = 0; i < slice.parts.length; i ++) {
-				var part = slice.parts[i];
-
-				if (part.intersect.closed) {
-					pathToGCode(part.outerLine, false, true, "outerLine");
-
-					for (var j = 0; j < part.innerLines.length; j ++) {
-						var innerLine = part.innerLines[j];
-						pathToGCode(innerLine, false, false, "innerLine");
-					}
-
-					pathToGCode(part.fill, true, false, "fill");
-				}
-				else {
-					var retract = !(slice.parts.length === 1 && slice.support === undefined);
-					pathToGCode(part.intersect, retract, retract, "outerLine");
-				}
-			}
-
-			if (slice.support !== undefined) {
-				pathToGCode(slice.support, true, true, "support");
-			}
-		}
-
-		this.progress.generatedGCode = true;
-		this._updateProgress(settings);
-
-		return gcode.getGCode();
-	}
-
-	_updateProgress (settings) {
-		if (this.onprogress !== undefined) {
-			var supportEnabled = settings.config["supportEnabled"];
-
-			var progress = {};
-
-			var procent = 0;
-			var length = 0;
-			for (var i in this.progress) {
-				if (!(!supportEnabled && i === "generatedSupport")) {
-					progress[i] = this.progress[i];
-					if (progress[i]) {
-						procent += 1;
-					}
-					length += 1;
-				}
-			}
-
-			progress.procent = procent / length;
-
-			this.onprogress(progress);
-		}
-	}
 }
diff --git a/src/slicerworker.js b/src/slicerworker.js
deleted file mode 100644
index 0ca3f9e..0000000
--- a/src/slicerworker.js
+++ /dev/null
@@ -1,98 +0,0 @@
-import THREE from 'three.js';
-import Settings from './settings.js';
-
-export default class {
-	constructor () {
-		this.worker = new Worker('./worker.js');
-
-		this.worker.addEventListener('message', (event) => {
-			switch (event.data['cmd']) {
-				case 'PROGRESS':
-
-					if (this.onprogress !== undefined) {
-						var progress = event.data['progress'];
-
-						this.onprogress(progress);
-					}
-				break;
-
-				case 'GCODE':
-					if (this.onfinish !== undefined) {
-						var reader = new FileReader();
-						reader.addEventListener("loadend", () => {
-							var gcode = reader.result;
-							this.onfinish(gcode);
-						});
-						reader.readAsBinaryString(event.data['gcode']);
-					}
-				break;
-			}
-		}, false);
-
-		this.worker.onerror = function (error) {
-			console.warn(error);
-		};
-	}
-
-	setMesh (mesh) {
-		mesh.updateMatrix();
-
-		this.setGeometry(mesh.geometry, mesh.matrix);
-
-		return this;
-	}
-
-	setGeometry (geometry, matrix) {
-		if (geometry.type === 'Geometry') {
-			geometry = new THREE.BufferGeometry().fromGeometry(geometry);
-		}
-		else if (geometry.type === 'BufferGeometry') {
-			geometry = geometry.clone();
-		}
-		else {
-			console.warn('Geometry is not an instance of BufferGeometry or Geometry');
-			return;
-		}
-
-		if (!(matrix instanceof THREE.Matrix4)) {
-			matrix = new THREE.Matrix4();
-		}
-
-		var buffers = [];
-		for (var i = 0; i < geometry.attributesKeys.length; i ++) {
-			var key = geometry.attributesKeys[i];
-			buffers.push(geometry.attributes[key].array.buffer);
-		}
-
-		delete geometry.boundingBox;
-		delete geometry.boundingSphere;
-
-		this.worker.postMessage({
-			'cmd': 'SET_MESH', 
-			'geometry': {
-				'attributes': geometry.attributes, 
-				'attributesKeys': geometry.attributesKeys
-			}, 
-			'matrix': matrix.toArray()
-		}, buffers);
-
-		return this;
-	}
-
-	slice (settings) {
-		this.worker.postMessage({
-			'cmd': 'SLICE', 
-			'settings': settings.config
-		});
-
-		return this;
-	}
-
-	close () {
-		this.worker.postMessage({
-			'cmd': 'CLOSE'
-		});
-
-		return this;
-	}
-}
\ No newline at end of file
diff --git a/src/worker.js b/src/worker.js
deleted file mode 100644
index 02964dc..0000000
--- a/src/worker.js
+++ /dev/null
@@ -1,55 +0,0 @@
-importScripts('../jspm_packages/system.js');
-importScripts('../config.js');
-
-var Slicer, Settings, THREE;
-
-function init () {
-	var slicer = new Slicer();
-	slicer.onProgress = function (progress) {
-		self.postMessage({
-			'cmd': 'PROGRESS', 
-			'progress': progress
-		});
-	};
-
-	self.addEventListener('message', function (event) {
-		switch (event.data['cmd']) {
-			case 'SET_MESH': 				
-				var geometry = new THREE.Geometry().fromBufferGeometry(event.data['geometry']);
-				var matrix = new THREE.Matrix4().fromArray(event.data['matrix']);
-
-				slicer.setGeometry(geometry, matrix);
-			break;
-
-			case 'SLICE':
-				var settings = new Settings().updateConfig(event.data['settings']);
-
-				var gcode = slicer.slice(settings);
-				var blob = new Blob([gcode], {type: 'text/plain'});
-
-				self.postMessage({
-					'cmd': 'GCODE', 
-					'gcode': blob
-				});
-
-				//self.close();
-			break;
-
-			case 'CLOSE': 
-				self.close();
-			break;
-		}
-	});
-}
-
-Promise.all([
-	System.import('./slicer'),
-	System.import('./settings'),
-	System.import('three.js')
-]).then(function(modules) {
-	Slicer = modules[0].default;
-	Settings = modules[1].default;
-	THREE = modules[2];
-
-	init();
-});