diff --git a/slice_test.html b/slice_test.html
index 8d2641f..e0cc28c 100644
--- a/slice_test.html
+++ b/slice_test.html
@@ -37,7 +37,7 @@ function init () {
 
 	var loader = new THREE.STLLoader();
 	loader.load("models/dom.stl", function (geometry) {
-		var geometry = new THREE.BoxGeometry(10, 10, 10, 1, 1, 1);
+		//var geometry = new THREE.BoxGeometry(10, 10, 10, 1, 1, 1);
 		//var geometry = new THREE.SphereGeometry(10, 20, 10);
 		//var geometry = new THREE.TorusGeometry(20, 10, 30, 30);
 		/*
diff --git a/src/gcode.js b/src/gcode.js
index 24795d0..f1e8ebc 100644
--- a/src/gcode.js
+++ b/src/gcode.js
@@ -9,12 +9,32 @@
 D3D.GCode = function () {
 	"use strict";
 
+	this.current = {};
+
 	this.extruder = 0.0;
 	this.bottom = true;
 	this.isRetracted = false;
+	this.isFanOn = false;
 	this.gcode = [];
 	this.nozzlePosition = new THREE.Vector2(0, 0);
 };
+D3D.GCode.prototype.addGCode = function (command) {
+	"use strict";
+
+	var str = [];
+
+	for (var i in command) {
+		if (this.current[i] !== command[i] || i === "G") {
+			str.push(i + command[i]);
+			this.current[i] = command[i];
+		}
+	}
+
+	str = str.join(" ");
+	if (str.length > 0) {
+		this.gcode.push(str);
+	}
+};
 D3D.GCode.prototype.setSettings = function (printer) {
 	"use strict";
 
@@ -22,10 +42,33 @@ D3D.GCode.prototype.setSettings = function (printer) {
 
 	return this;
 };
-D3D.GCode.prototype.turnOnFan = function () {
+D3D.GCode.prototype.turnFanOn = function (fanSpeed) {
 	"use strict";
 
-	this.gcode.push("M106");
+	this.isFanOn = true;
+
+	var gcode = {
+		"M": 106
+	};
+
+	if (fanSpeed !== undefined) {
+		gcode["S"] = fanSpeed;
+	}
+
+	this.addGCode(gcode);
+
+	return this;
+};
+D3D.GCode.prototype.turnFanOff = function () {
+	"use strict";
+
+	this.isFanOn = false;
+
+	this.addGCode({
+		"M": 107
+	});
+
+	return this;
 };
 D3D.GCode.prototype.moveTo = function (extrude, x, y, layer) {
 	"use strict";
@@ -58,30 +101,27 @@ D3D.GCode.prototype.moveTo = function (extrude, x, y, layer) {
 		var filamentSurfaceArea = Math.pow((filamentThickness/2), 2) * Math.PI;
 		this.extruder += lineLength * nozzleDiameter * layerHeight / filamentSurfaceArea * flowRate;
 
-		this.gcode.push(
-			"G1" + 
-			" X" + x.toFixed(3) + 
-			" Y" + y.toFixed(3) + 
-			((z !== this.lastZ) ? (" Z" + z.toFixed(3)) : "") + 
-			((speed !== this.lastSpeed) ? (" F" + speed.toFixed(3)) : "") + 
-			" E" + this.extruder.toFixed(3)
-		);
+		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)
+		});
 	}
 	else {
 		var speed = travelSpeed * 60;
 
-		this.gcode.push(
-			"G0" + 
-			" X" + x.toFixed(3) + " Y" + y.toFixed(3) + " Z" + z + 
-			" F" + speed.toFixed(3)
-		);
+		this.addGCode.({
+			"G": 0, 
+			"X": x.toFixed(3), "Y": y.toFixed(3), "Z": z.toFixed(3), 
+			"F": speed.toFixed(3)
+		});
 
 	}
 
-	this.lastSpeed = speed;
-	this.lastZ = z;
-
 	this.nozzlePosition = new THREE.Vector2(x, y);
+
+	return this;
 };
 D3D.GCode.prototype.unRetract = function () {
 	"use strict";
@@ -96,12 +136,14 @@ D3D.GCode.prototype.unRetract = function () {
 	var speed = retractionSpeed * 60;
 
 	if (this.extruder > retractionMinDistance && retractionEnabled) {
-		this.gcode.push(
-			"G0" + 
-			" E" + this.extruder.toFixed(3) + 
-			" F" + (speed * 60).toFixed(3)
-		);
+		this.addGCode({
+			"G": 0, 
+			"E": this.extruder.toFixed(3), 
+			"F": speed.toFixed(3)
+		});
 	}
+
+	return this;
 };
 D3D.GCode.prototype.retract = function () {
 	"use strict";
@@ -116,16 +158,16 @@ D3D.GCode.prototype.retract = function () {
 	var speed = retractionSpeed * 60;
 
 	if (this.extruder > retractionMinDistance && retractionEnabled) {
-		this.gcode.push(
-			"G0" +
-			" E" + (this.extruder - retractionAmount).toFixed(3) + 
-			" F" + speed.toFixed(3)
-		);
+		this.addGCode({
+			"G": 0, 
+			"E": (this.extruder - retractionAmount).toFixed(3), 
+			"F": speed.toFixed(3)
+		});
 	}
 
-	this.lastSpeed = speed;
+	return this;
 };
-D3D.GCode.prototype.getFinal = function () {
+D3D.GCode.prototype.getGCode = function () {
 	"use strict";
 
 	return this.settings.getStartCode().concat(this.gcode, this.settings.getEndCode());
diff --git a/src/slicer.js b/src/slicer.js
index d2372da..73cf1e7 100644
--- a/src/slicer.js
+++ b/src/slicer.js
@@ -24,26 +24,23 @@ D3D.Slicer.prototype.setMesh = function (geometry, matrix) {
 		geometry = new THREE.Geometry().fromBufferGeometry(geometry);
 	}
 
-	//remove duplicate vertices;
+	//apply mesh matrix on geometry;
+	geometry.applyMatrix(matrix);
+	geometry.mergeVertices();
+	geometry.computeFaceNormals();
+	geometry.computeBoundingBox();
+	
 	/*
-	for (var i = 0; i < geometry.vertices.length; i ++) {
-		var vertexA = geometry.vertices[i];
+	for (var i = 0; i < geometry.faces.length; i ++) {
+		var face = geometry.faces[i];
+		var normal = face.normal;
 
-		for (var j = i + 1; j < geometry.vertices.length; j ++) {
-			var vertexB = geometry.vertices[j];
-
-			if (vertexA.equals(vertexB)) {
-				geometry.vertices[j] = vertexA;
-			}
+		if (normal.x === 0 && normal.y === 0 && normal.z === 0) {
+			geometry.faces.splice(i, 1);
+			i --;
 		}
 	}
 	*/
-	geometry.mergeVertices();
-
-	//apply mesh matrix on geometry;
-	geometry.applyMatrix(matrix);
-	geometry.computeFaceNormals();
-	geometry.computeBoundingBox();
 
 	this.geometry = geometry;
 
@@ -77,9 +74,7 @@ D3D.Slicer.prototype.createLines = function () {
 
 	var self = this;
 	function addLine (a, b) {
-
-		//think lookup can only be b_a, a_b is only possible when face is flipped
-		var index = lineLookup[b + "_" + a] || lineLookup[a + "_" + b];
+		var index = lineLookup[b + "_" + a];
 
 		if (index === undefined) {
 			index = self.lines.length;
@@ -123,6 +118,7 @@ D3D.Slicer.prototype.createLines = function () {
 };
 D3D.Slicer.prototype.slice = function (layerHeight, height) {
 	"use strict";
+	var numLayers = height / layerHeight;
 
 	var layersIntersections = [];
 
@@ -133,7 +129,7 @@ D3D.Slicer.prototype.slice = function (layerHeight, height) {
 		var max = Math.floor(Math.max(line.start.y, line.end.y) / layerHeight);
 
 		for (var layerIndex = min; layerIndex <= max; layerIndex ++) {
-			if (layerIndex >= 0 && layerIndex < height / layerHeight) {
+			if (layerIndex >= 0 && layerIndex < numLayers) {
 				if (layersIntersections[layerIndex] === undefined) {
 					layersIntersections[layerIndex] = [];
 				}
@@ -151,6 +147,7 @@ D3D.Slicer.prototype.slice = function (layerHeight, height) {
 		var y = layer * layerHeight;
 
 		var intersections = [];
+		var log = [];
 		for (var i = 0; i < layerIntersections.length; i ++) {
 			var index = layerIntersections[i];
 			var line = this.lines[index].line;
@@ -164,8 +161,14 @@ D3D.Slicer.prototype.slice = function (layerHeight, height) {
 				var x = line.end.x * alpha + line.start.x * (1 - alpha);
 				var z = line.end.z * alpha + line.start.z * (1 - alpha);
 			}
+
 			intersections[index] = new THREE.Vector2(z, x);
+			log.push({x: z, y: x, index: index, connects: this.lines[index].connects});
 		}
+		/*if (layer === 10) {
+			console.log(JSON.stringify(log));
+			breakCode();
+		}*/
 
 		var done = [];
 		var slice = [];
@@ -179,24 +182,33 @@ D3D.Slicer.prototype.slice = function (layerHeight, height) {
 					var intersection = intersections[index];
 					shape.push({X: intersection.x, Y: intersection.y});
 
-					done.push(index);
-
 					var connects = this.lines[index].connects;
 					var faceNormals = this.lines[index].normals;
 					for (var j = 0; j < connects.length; j ++) {
 						index = connects[j];
 
-						if (intersections[index] && done.indexOf(index) === -1) {
+						if (intersections[index] !== undefined && done.indexOf(index) === -1) {
+							done.push(index);
+
 							var a = new THREE.Vector2(intersection.x, intersection.y);
 							var b = intersections[index];
-							var normal = a.sub(b).normal().normalize();
-							var faceNormal = faceNormals[Math.floor(j/2)];
 
-							if (normal.dot(faceNormal) > 0) {
-								break;
+							if (a.distanceTo(b) === 0) {
+								connects = connects.concat(this.lines[index].connects);
+								faceNormals = faceNormals.concat(this.lines[index].normals);
+								index = -1;
 							}
 							else {
-								index = -1;
+								var normal = a.sub(b).normal().normalize();
+								var faceNormal = faceNormals[Math.floor(j/2)];
+
+								if (normal.dot(faceNormal) >= 0) {
+								//if (true) {
+									break;
+								}
+								else {
+									index = -1;
+								}
 							}
 						}
 						else {
@@ -234,6 +246,7 @@ D3D.Slicer.prototype.slice = function (layerHeight, height) {
 			}
 		}
 
+
 		var layerParts = [];
 
 		for (var i = 0; i < slice.length; i ++) {
@@ -265,7 +278,6 @@ D3D.Slicer.prototype.slice = function (layerHeight, height) {
 		this.progress.sliceLayer = layer;
 		this.updateProgress();
 	}
-
 	return slices;
 };
 D3D.Slicer.prototype.slicesToData = function (slices, printer) {
@@ -405,7 +417,7 @@ D3D.Slicer.prototype.getFillTemplate = function (bounds, size, even, uneven) {
 	return paths;
 };
 /*
-D3D.Slicer.prototype.dataToGcode = function (data, printer) {
+D3D.Slicer.prototype.dataToGCode = function (data, printer) {
 	"use strict";
 
 	var layerHeight = printer.config["printer.layerHeight"];
@@ -423,7 +435,7 @@ D3D.Slicer.prototype.dataToGcode = function (data, printer) {
 	var retractionMinDistance = printer.config["printer.retraction.minDistance"];
 	var retractionAmount = printer.config["printer.retraction.amount"];
 
-	function sliceToGcode (path) {
+	function sliceToGCode (path) {
 		var gcode = [];
 
 		for (var i = 0; i < path.length; i ++) {
@@ -507,9 +519,9 @@ D3D.Slicer.prototype.dataToGcode = function (data, printer) {
 		for (var i = 0; i < slice.length; i ++) {
 			var layerPart = slice[i];
 
-			gcode = gcode.concat(sliceToGcode(layerPart.outerLayer));
-			gcode = gcode.concat(sliceToGcode(layerPart.insets));
-			gcode = gcode.concat(sliceToGcode(layerPart.fill));
+			gcode = gcode.concat(sliceToGCode(layerPart.outerLayer));
+			gcode = gcode.concat(sliceToGCode(layerPart.insets));
+			gcode = gcode.concat(sliceToGCode(layerPart.fill));
 		}
 
 		this.progress.gcodeLayer = layer;
@@ -521,12 +533,12 @@ D3D.Slicer.prototype.dataToGcode = function (data, printer) {
 	return gcode;
 };
 */
-D3D.Slicer.prototype.dataToGcode = function (data, printer) {
+D3D.Slicer.prototype.dataToGCode = function (data, printer) {
 	"use strict";
 
 	var gcode = new D3D.GCode().setSettings(printer);
 
-	function sliceToGcode (path, retract, unRetract) {
+	function sliceToGCode (path, retract, unRetract) {
 		for (var i = 0; i < path.length; i ++) {
 			var shape = path[i];
 
@@ -557,25 +569,25 @@ D3D.Slicer.prototype.dataToGcode = function (data, printer) {
 		var slice = data[layer];
 
 		if (layer === 1) {
-			gcode.turnOnFan();
+			gcode.turnFanOn();
 			gcode.bottom = false;
 		}
 
 		for (var i = 0; i < slice.length; i ++) {
 			var layerPart = slice[i];
 
-			sliceToGcode(layerPart.outerLayer, false, true);
-			sliceToGcode(layerPart.insets, false, false);
-			sliceToGcode(layerPart.fill, true, false);
+			sliceToGCode(layerPart.outerLayer, false, true);
+			sliceToGCode(layerPart.insets, false, false);
+			sliceToGCode(layerPart.fill, true, false);
 		}
 
 		this.progress.gcodeLayer = layer;
 		this.updateProgress();
 	}
 
-	return gcode.getFinal();
+	return gcode.getGCode();
 };
-D3D.Slicer.prototype.getGcode = function (printer) {
+D3D.Slicer.prototype.getGCode = function (printer) {
 	"use strict";
 
 	var layerHeight = printer.config["printer.layerHeight"];
@@ -597,7 +609,7 @@ D3D.Slicer.prototype.getGcode = function (printer) {
 	console.log("Data: " + (end - start) + "ms");
 
 	start = new Date().getTime();
-	var gcode = this.dataToGcode(data, printer);
+	var gcode = this.dataToGCode(data, printer);
 	end = new Date().getTime();
 	console.log("Gcode: " + (end - start) + "ms");
 
diff --git a/src/slicerworker.js b/src/slicerworker.js
index 7135383..c6980c1 100644
--- a/src/slicerworker.js
+++ b/src/slicerworker.js
@@ -7,6 +7,7 @@ D3D.SlicerWorker = function () {
 	this.worker.addEventListener('message', function (event) {
 		switch (event.data['cmd']) {
 			case 'PROGRESS':
+
 				if (scope.onprogress !== undefined) {
 					var progress = event.data['progress'];
 
diff --git a/src/utils.js b/src/utils.js
index 9d5efd2..d35f75b 100644
--- a/src/utils.js
+++ b/src/utils.js
@@ -1,7 +1,7 @@
 /******************************************************
 *
 * Utils
-* requires jQuery, Three.js
+* dependices Three.js
 *
 ******************************************************/
 
@@ -14,6 +14,37 @@ var D3D = {
 function sendAPI (url, data, callback) {
 	"use strict";
 
+	/*
+	var form = new FormData();
+
+	for (var i in data) {
+		form.append(i, JSON.stringify(data[i]));
+	}
+
+	var request = new XMLHttpRequest();
+	request.open('POST', url, true);
+	request.send(data);
+	request.onreadystatechange = function () {
+		if (request.readyState === 4 && request.status === 200) {
+			var response = JSON.parse(request.responseText);
+
+			if (response.status === "success") {
+				if (callback !== undefined) {
+					callback(response.data);
+				}
+			}
+			else {
+				console.warn(response.msg);
+			}
+		}
+		else {
+			console.log(request);
+			console.warn("Failed connecting to " + url);
+			//sendAPI(url, data, callback);
+		}
+	};
+	*/
+
 	$.ajax({
 		url: url, 
 		type: "POST", 
@@ -38,7 +69,30 @@ function sendAPI (url, data, callback) {
 
 function getAPI (url, callback) {
 	"use strict";
+	/*
+	var request = new XMLHttpRequest();
+	request.open('GET', url, true);
+	request.send();
+	request.onreadystatechange = function () {
+		if (request.readyState === 4 && request.status === 200) {
+			var response = JSON.parse(request.responseText);
 
+			if (response.status === "success") {
+				if (callback !== undefined) {
+					callback(response.data);
+				}
+			}
+			else {
+				console.warn(response.msg);
+			}
+		}
+		else {
+			console.warn("Failed connecting to " + url);
+			sendAPI(url, callback);
+		}
+	};*/
+
+	
 	$.ajax({
 		url: url, 
 		dataType: "json", 
@@ -57,6 +111,7 @@ function getAPI (url, callback) {
 		console.warn("Failed connecting to " + url);
 		getAPI(url, callback);
 	});
+	
 }
 
 function loadSettings (url, callback) {
diff --git a/webworker/worker.js b/webworker/worker.js
index 5742885..d603fff 100644
--- a/webworker/worker.js
+++ b/webworker/worker.js
@@ -16,7 +16,6 @@ slicer.onProgress = function (progress) {
 		"progress": progress
 	});
 
-	//console.log(progress);
 };
 
 self.addEventListener("message", function (event) {
@@ -42,7 +41,7 @@ self.addEventListener("message", function (event) {
 		break;
 
 		case "SLICE":
-			var gcode = slicer.getGcode(printer);
+			var gcode = slicer.getGCode(printer);
 
 			self.postMessage({
 				"cmd": "GCODE", 
diff --git a/webworker_test.html b/webworker_test.html
index 9c2a538..71e9ce6 100644
--- a/webworker_test.html
+++ b/webworker_test.html
@@ -16,7 +16,7 @@ canvas {border: 1px solid black;}
 #progress {height: 20px; width: 200px; border: 1px solid black; overflow: hidden;}
 #progress_bar {height: 20px; background-color: lightblue; width: 0%;}
 .block {border: 1px solid black; width: 400px; height: 400px; display: inline-block;}
-#start_print {display: none;}
+#start_print, #download {display: none;}
 </style>
 </head>
 <body>
@@ -33,8 +33,9 @@ canvas {border: 1px solid black;}
 	<p>Total Lines: <span id='total_lines'></span></p>
 	<p>Batches To Send: <span id='print_batches'></span></p>
 	<div id='progress'><div id='progress_bar'></div></div>
-	<button id="start_print">Start Print</button>
 	<button id="stop_print">Stop Print</button>
+	<button id="start_print">Start Print</button>
+	<button id="download">Download Gcode</button>
 </div>
 
 <script>
@@ -48,10 +49,7 @@ function init () {
 	var localIp = location.hash.substring(1);
 	doodleBox = new D3D.Box(localIp);
 
-	printer = new D3D.Printer().updateConfig(USER_SETTINGS).updateConfig(PRINTER_SETTINGS['ultimaker2go']);
-
 	doodleBox.onupdate = function (data) {
-
 		document.getElementById('state').innerHTML = data.state;
 		document.getElementById('bed_temp').innerHTML = data.bed;
 		document.getElementById('bed_target_temp').innerHTML = data.bed_target;
@@ -63,6 +61,8 @@ function init () {
 		document.getElementById('print_batches').innerHTML = doodleBox.printBatches.length;
 	};
 
+	printer = new D3D.Printer().updateConfig(USER_SETTINGS).updateConfig(PRINTER_SETTINGS['ultimaker2go']);
+
 	document.getElementById('stop_print').onclick = function () {
 		doodleBox.stopPrint(printer);
 	};
@@ -77,22 +77,30 @@ function init () {
 	};
 	slicer.onfinish = function (_gcode) {
 		gcode = _gcode;
-		var button = document.getElementById('start_print');
-		button.style.display = 'initial';
-		button.onclick = function () {
+		var startPrintButton = document.getElementById('start_print');
+		var downloadButton = document.getElementById('download');
+
+		startPrintButton.style.display = 'initial';
+		startPrintButton.onclick = function () {
 			doodleBox.print(gcode);
 		};
+
+		downloadButton.style.display = 'initial';
+		downloadButton.onclick = function () {
+			downloadFile("gcode.gcode", gcode.join('\n'));
+		};
 	};
 
 	var loader = new THREE.STLLoader();
-	loader.load('models/pokemon/pikachu.stl', function (geometry) {
-		var geometry = new THREE.TorusGeometry(20, 10, 30, 30).clone();
-		
+	loader.load('models/dom.stl', function (geometry) {
+		//var geometry = new THREE.TorusGeometry(20, 10, 30, 30).clone();
+
 		var material = new THREE.MeshPhongMaterial({color: 0x00ff00, wireframe: false});
+		//var material = new THREE.MeshBasicMaterial({color: 0x000000, wireframe: true});
 		var mesh = new THREE.Mesh(geometry, material);
 
 		mesh.rotation.x = -Math.PI/2;
-		mesh.scale.x = mesh.scale.y = mesh.scale.z = 0.5;
+		mesh.scale.x = mesh.scale.y = mesh.scale.z = 1;
 		mesh.position.y = -0.1;
 		mesh.position.x = 60;
 		mesh.position.z = 60;