diff --git a/src/box.js b/src/box.js
index cbc450e..4b15095 100644
--- a/src/box.js
+++ b/src/box.js
@@ -74,7 +74,7 @@ D3D.Box.prototype.init = function () {
 				}
 			}
 
-			scope.updateLoop();
+			scope.updateState();
 		});
 	});
 
@@ -88,7 +88,7 @@ D3D.Box.prototype.updateLoop = function () {
 	//Bij error wordt gelijk zelfde data opnieuw gestuurd
 	//Als DoodleBox ontkoppeld wordt komt er een error in de loop waardoor pagina breekt en ververst moet worden
 
-	if (this.printBatches.length > 0 && (this.status["buffered_lines"] + this.batches[0].length) <= this.maxBufferedLines) {
+	if (this.printBatches.length > 0 && (this.status["buffered_lines"] + this.printBatches[0].length) <= this.maxBufferedLines) {
 	//if (this.printBatches.length > 0 ) {
 		this.printBatch();
 	}
diff --git a/src/gcode.js b/src/gcode.js
index a36fa19..2cf5955 100644
--- a/src/gcode.js
+++ b/src/gcode.js
@@ -19,9 +19,9 @@ D3D.GCode = function () {
 	this.bottom = true;
 	this.isRetracted = false;
 	this.isFanOn = false;
-	this.nozzlePosition = new THREE.Vector2(0, 0);
+	this._nozzlePosition = new THREE.Vector2(0, 0);
 };
-D3D.GCode.prototype.addGCode = function (command) {
+D3D.GCode.prototype._addGCode = function (command) {
 	"use strict";
 
 	var str = [];
@@ -62,7 +62,7 @@ D3D.GCode.prototype.turnFanOn = function (fanSpeed) {
 		gcode["S"] = fanSpeed;
 	}
 
-	this.addGCode(gcode);
+	this._addGCode(gcode);
 
 	return this;
 };
@@ -71,7 +71,7 @@ D3D.GCode.prototype.turnFanOff = function () {
 
 	this.isFanOn = false;
 
-	this.addGCode({
+	this._addGCode({
 		"M": 107
 	});
 
@@ -86,13 +86,13 @@ D3D.GCode.prototype.moveTo = function (x, y, layer) {
 	var z = (layer + 1) * layerHeight;
 	var speed = travelSpeed * 60;
 
-	this.addGCode({
+	this._addGCode({
 		"G": 0, 
 		"X": x.toFixed(3), "Y": y.toFixed(3), "Z": z.toFixed(3), 
 		"F": speed.toFixed(3)
 	});
 	
-	this.nozzlePosition.set(x, y);
+	this._nozzlePosition.set(x, y);
 
 	return this;
 };
@@ -112,19 +112,19 @@ D3D.GCode.prototype.lineTo = function (x, y, layer, type) {
 	var flowRate = profile["flowRate"];
 	var z = (layer + 1) * layerHeight;
 
-	var lineLength = this.nozzlePosition.distanceTo(newNozzlePosition);
+	var lineLength = this._nozzlePosition.distanceTo(newNozzlePosition);
 
 	var filamentSurfaceArea = Math.pow((filamentThickness/2), 2) * Math.PI;
 	this.extruder += lineLength * nozzleDiameter * layerHeight / filamentSurfaceArea * flowRate;
 
-	this.addGCode({
+	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)
 	});
 
-	this.nozzlePosition.copy(newNozzlePosition);
+	this._nozzlePosition.copy(newNozzlePosition);
 
 	return this;
 };
@@ -141,7 +141,7 @@ D3D.GCode.prototype.unRetract = function () {
 		var speed = retractionSpeed * 60;
 
 		if (this.extruder > retractionMinDistance) {
-			this.addGCode({
+			this._addGCode({
 				"G": 0, 
 				"E": this.extruder.toFixed(3), 
 				"F": speed.toFixed(3)
@@ -165,7 +165,7 @@ D3D.GCode.prototype.retract = function () {
 		var speed = retractionSpeed * 60;
 
 		if (this.extruder > retractionMinDistance && retractionEnabled) {
-			this.addGCode({
+			this._addGCode({
 				"G": 0, 
 				"E": (this.extruder - retractionAmount).toFixed(3), 
 				"F": speed.toFixed(3)
diff --git a/src/slicer.js b/src/slicer.js
index 1d1ddf4..8205bd1 100644
--- a/src/slicer.js
+++ b/src/slicer.js
@@ -129,12 +129,9 @@ D3D.Slicer.prototype.slice = function (layerHeight, height) {
 
 	var slices = [];
 
-	//still error in first layer, so remove first layer & last layer
-	//see https://github.com/Doodle3D/Doodle3D-Slicer/issues/1
 	for (var layer = 1; layer < layersIntersections.length; layer ++) {
 		var layerIntersections = layersIntersections[layer];
 
-		//why have a slice with only support?
 		if (layerIntersections.length > 0) {
 
 			var y = layer * layerHeight;
@@ -205,7 +202,6 @@ D3D.Slicer.prototype.slice = function (layerHeight, height) {
 						}
 					}
 
-					//think this check is not nescesary, always higher as 0
 					if (shape.length > 1) {
 						var part = new D3D.Paths([shape]).clean(0.01);
 						sliceParts.push(part);
@@ -451,7 +447,7 @@ D3D.Slicer.prototype.getFillTemplate = function (bounds, size, even, uneven) {
 	
 	return paths;
 };
-D3D.Slicer.prototype.dataToGCode = function (data, printer) {
+D3D.Slicer.prototype.dataToGCode = function (slices, printer) {
 	"use strict";
 
 	var gcode = new D3D.GCode().setSettings(printer);
@@ -484,8 +480,8 @@ D3D.Slicer.prototype.dataToGCode = function (data, printer) {
 		}
 	}
 
-	for (var layer = 0; layer < data.length; layer ++) {
-		var slice = data[layer];
+	for (var layer = 0; layer < slices.length; layer ++) {
+		var slice = slices[layer];
 
 		if (layer === 1) {
 			gcode.turnFanOn();