diff --git a/src/settings.js b/src/settings.js
index a21971c..54008ce 100644
--- a/src/settings.js
+++ b/src/settings.js
@@ -11,47 +11,48 @@ export default class {
 		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) {
-		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"];
+		let {
+			temperature,
+			bedTemperature,
+			heatTemperature,
+			heatBedTemperature,
+			travelSpeed,
+			printerType,
+			heatedbed
+		} = this.config;
+
+		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 ? "" : ";";
 
-		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(/{printerType}/gi, printerType);
-		gcode = gcode.replace(/{travelSpeed}/gi, travelSpeed);
-		gcode = gcode.replace(/{if heatedBed}/gi, heatedBedReplacement);
+		const heatedBedReplacement = heatedbed ? '' : ';';
+
+		gcode = gcode.replace(/{ printingTemp }/gi, temperature);
+		gcode = gcode.replace(/{ printingBedTemp }/gi, bedTemperature);
+		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);
 
 		return gcode;
 	}