diff --git a/src/interface/index.js b/src/interface/index.js
index 3f85d5d..feac50a 100644
--- a/src/interface/index.js
+++ b/src/interface/index.js
@@ -63,7 +63,8 @@ const styles = {
   sliceInfo: {
     margin: '10px 0',
     '& p': {
-      marginBottom: '5px'
+      marginBottom: '5px',
+      fontSize: '11px'
     }
   },
   sliceButtons: {
diff --git a/src/interface/utils.js b/src/interface/utils.js
index 51a99b1..2543225 100644
--- a/src/interface/utils.js
+++ b/src/interface/utils.js
@@ -175,7 +175,7 @@ export async function slice(target, name, mesh, settings, updateProgress) {
   const centerY = dimensions.y / 2;
 
   const matrix = new THREE.Matrix4().makeTranslation(centerY, 0, centerX).multiply(mesh.matrix);
-  const { gcode } = await sliceGeometry(settings, mesh.geometry, mesh.material, matrix, false, false, ({ progress }) => {
+  const { gcode } = await sliceGeometry(settings, mesh.geometry, mesh.material, matrix, true, false, ({ progress }) => {
     updateProgress({
       action: progress.action,
       percentage: (currentStep + progress.done / progress.total) / steps
diff --git a/src/sliceActions/addBrim.js b/src/sliceActions/addBrim.js
index f3e7627..201d0fc 100644
--- a/src/sliceActions/addBrim.js
+++ b/src/sliceActions/addBrim.js
@@ -1,7 +1,7 @@
 import Shape from 'clipper-js';
 import { PRECISION } from '../constants.js';
 
-const offsetOptions = {
+const OFFSET_OPTIONS = {
   jointType: 'jtRound',
   miterLimit: 2.0,
   roundPrecision: 0.25,
@@ -22,7 +22,7 @@ export default function addBrim(slices, settings) {
 
   const brim = firstLayer.parts.reduce((brim, { shape }) => (
     brim.join(shape.offset(nozzleRadius, {
-      ...offsetOptions,
+      ...OFFSET_OPTIONS,
       endType: shape.closed ? 'etClosedPolygon' : 'etOpenRound'
     }))
   ), new Shape([], true)).simplify('pftNonZero');
@@ -30,7 +30,7 @@ export default function addBrim(slices, settings) {
   firstLayer.brim = new Shape([], true);
 
   for (let offset = 0; offset < brimSize; offset += nozzleDiameter) {
-    const brimPart = brim.offset(offset, offsetOptions);
+    const brimPart = brim.offset(offset, OFFSET_OPTIONS);
     firstLayer.brim = firstLayer.brim.join(brimPart);
   }
 }
diff --git a/src/sliceActions/calculateLayersIntersections.js b/src/sliceActions/calculateLayersIntersections.js
index 7dc2a45..1f9622a 100644
--- a/src/sliceActions/calculateLayersIntersections.js
+++ b/src/sliceActions/calculateLayersIntersections.js
@@ -8,7 +8,7 @@ export default function calculateLayersIntersections(lines, settings) {
 
   const numLayers = Math.floor((dimensionsZ - Z_OFFSET) / layerHeight);
 
-  const layerPoints = Array.from(Array(numLayers)).map(() => []);
+  const layerPoints = Array.from(Array(numLayers)).map(() => {});
   const layerFaceIndexes = Array.from(Array(numLayers)).map(() => []);
 
   for (let lineIndex = 0; lineIndex < lines.length; lineIndex ++) {
@@ -33,17 +33,13 @@ export default function calculateLayersIntersections(lines, settings) {
         }
 
         layerPoints[layerIndex][lineIndex] = { x: z, y: x };
-        layerFaceIndexes[layerIndex].push(...faces);
+        for (const faceIndex of faces) {
+          const layerFaceIndex = layerFaceIndexes[layerIndex];
+          if (!layerFaceIndex.includes(faceIndex)) layerFaceIndex.push(faceIndex);
+        }
       }
     }
   }
 
-  for (let i = 0; i < layerFaceIndexes.length; i ++) {
-    layerFaceIndexes[i] = layerFaceIndexes[i].reduce((result, faceIndex) => {
-      if (!result.includes(faceIndex)) result.push(faceIndex);
-      return result;
-    }, []);
-  }
-
   return { layerPoints, layerFaceIndexes };
 }
diff --git a/src/sliceActions/createLines.js b/src/sliceActions/createLines.js
index f0deb8a..9fff900 100644
--- a/src/sliceActions/createLines.js
+++ b/src/sliceActions/createLines.js
@@ -35,18 +35,16 @@ function addLine(vertices, lineLookup, lines, a, b, faceIndex) {
   if (typeof lineLookup[`${b}_${a}`] !== 'undefined') {
     index = lineLookup[`${b}_${a}`];
   } else {
-    index = lines.length;
-    lineLookup[`${a}_${b}`] = index;
-
     const start = getVertex(vertices, a);
     const end = getVertex(vertices, b);
-
     const line = { start, end };
     const faces = [];
+
+    index = lines.length;
+    lineLookup[`${a}_${b}`] = index;
     lines.push({ line, faces });
   }
   lines[index].faces.push(faceIndex);
-
   return index;
 }
 
diff --git a/src/sliceActions/generateInnerLines.js b/src/sliceActions/generateInnerLines.js
index 04e981f..2d7e751 100644
--- a/src/sliceActions/generateInnerLines.js
+++ b/src/sliceActions/generateInnerLines.js
@@ -1,6 +1,6 @@
 import { PRECISION } from '../constants.js'
 
-const offsetOptions = {
+const OFFSET_OPTIONS = {
   jointType: 'jtSquare',
   endType: 'etClosedPolygon',
   miterLimit: 2.0,
@@ -29,7 +29,7 @@ export default function generateInnerLines(slices, settings) {
 
       if (!part.closed) continue;
 
-      const outerLine = part.shape.offset(-nozzleRadius, offsetOptions);
+      const outerLine = part.shape.offset(-nozzleRadius, OFFSET_OPTIONS);
 
       if (outerLine.paths.length === 0) continue;
 
@@ -39,7 +39,7 @@ export default function generateInnerLines(slices, settings) {
       for (let inset = 1; inset < numShells; inset += 1) {
         const offset = inset * nozzleDiameter;
 
-        const shell = outerLine.offset(-offset, offsetOptions);
+        const shell = outerLine.offset(-offset, OFFSET_OPTIONS);
 
         if (shell.paths.length === 0) {
           break;
diff --git a/src/sliceActions/helpers/GCode.js b/src/sliceActions/helpers/GCode.js
index 18dfa96..0288cc3 100644
--- a/src/sliceActions/helpers/GCode.js
+++ b/src/sliceActions/helpers/GCode.js
@@ -10,7 +10,7 @@ export const POSITION_X = 'X';
 export const POSITION_Y = 'Y';
 export const POSITION_Z = 'Z';
 
-export default class {
+export default class GCode {
   constructor(layerHeight) {
     this._nozzleToFilamentRatio = 1;
     this._gcode = [`; Generated with Doodle3D Slicer V${VERSION}`];
diff --git a/src/sliceActions/helpers/Slice.js b/src/sliceActions/helpers/Slice.js
index 10b22fe..2f5c085 100644
--- a/src/sliceActions/helpers/Slice.js
+++ b/src/sliceActions/helpers/Slice.js
@@ -1,6 +1,6 @@
 import Shape from 'clipper-js';
 
-export default class {
+export default class Slice {
   constructor() {
     this.parts = [];
   }
diff --git a/src/sliceActions/helpers/comb.js b/src/sliceActions/helpers/comb.js
index 538cda9..671e8fa 100644
--- a/src/sliceActions/helpers/comb.js
+++ b/src/sliceActions/helpers/comb.js
@@ -45,9 +45,9 @@ export default function comb(outline, start, end) {
 
     if (snappedCombPaths.length === 0) {
       snappedCombPaths.push([start], [end]);
-    } else if (distanceTo(firstPath[0], start) > 1.0) {
+    } else if (distanceTo(firstPath[0], start) > 1.) {
       snappedCombPaths.unshift([start]);
-    } else if (distanceTo(lastPath[lastPath.length - 1], end) > 1.0) {
+    } else if (distanceTo(lastPath[lastPath.length - 1], end) > 1.) {
       snappedCombPaths.push([end]);
     }
 
diff --git a/src/sliceActions/intersectionsToShapes.js b/src/sliceActions/intersectionsToShapes.js
index 5d5646b..f7a5c39 100644
--- a/src/sliceActions/intersectionsToShapes.js
+++ b/src/sliceActions/intersectionsToShapes.js
@@ -79,7 +79,7 @@ export default function intersectionsToShapes(layerPoints, layerFaceIndexes, fac
         endConnects[pointB] = lineSegment;
 
         if (!shapes[objectIndex]) shapes[objectIndex] = [];
-        const shape = shapes[objectIndex].push(lineSegment);
+        shapes[objectIndex].push(lineSegment);
       }
     }
 
@@ -87,8 +87,6 @@ export default function intersectionsToShapes(layerPoints, layerFaceIndexes, fac
       const shape = shapes[objectIndex].map(lineSegment => lineSegment.map(pointIndex => points[pointIndex]));
       const openShape = openObjectIndexes[objectIndex];
 
-      const lines = [];
-
       const connectPoints = [];
       for (let pathIndex = 0; pathIndex < shape.length; pathIndex ++) {
         const path = shape[pathIndex];
@@ -114,6 +112,7 @@ export default function intersectionsToShapes(layerPoints, layerFaceIndexes, fac
         if (shapeEndPoint) connectPoints.push({ point: shapeEndPoint, start: null, end: pathIndex });
       }
 
+      const lines = [];
       while (connectPoints.length !== 0) {
         let { start, end } = connectPoints.pop();
 
diff --git a/src/sliceActions/shapesToSlices.js b/src/sliceActions/shapesToSlices.js
index b681a72..9e439cc 100644
--- a/src/sliceActions/shapesToSlices.js
+++ b/src/sliceActions/shapesToSlices.js
@@ -32,21 +32,12 @@ export default function shapesToSlices(shapes, settings) {
 
       slice.add(fillShape, true);
 
-      if (lineShapesClosed.paths.length > 0) {
-        lineShapesClosed = lineShapesClosed.difference(fillShape);
-      }
-      if (lineShapesOpen.paths.length > 0) {
-        lineShapesOpen = lineShapesOpen.difference(fillShape);
-      }
+      if (lineShapesClosed.paths.length > 0) lineShapesClosed = lineShapesClosed.difference(fillShape);
+      if (lineShapesOpen.paths.length > 0) lineShapesOpen = lineShapesOpen.difference(fillShape);
     }
 
-    if (lineShapesClosed.paths.length > 0) {
-      slice.add(lineShapesClosed, false);
-    }
-
-    if (lineShapesOpen.paths.length > 0) {
-      slice.add(lineShapesOpen, false);
-    }
+    if (lineShapesClosed.paths.length > 0) slice.add(lineShapesClosed, false);
+    if (lineShapesOpen.paths.length > 0) slice.add(lineShapesOpen, false);
 
     sliceLayers.push(slice);
   }