diff --git a/calibration.html b/calibration.html
index 7dc0b14..5328d4f 100644
--- a/calibration.html
+++ b/calibration.html
@@ -173,6 +173,7 @@
             <h4>Additional start gcode</h4>
             <p>If you have additional start commands, tick the box and enter the gcode. This will be inserted after temperatures are set and homing/ABL is complete. This can be used to add a hot end purge command. For the majority of users, you can skip this section.</p>
             <label>Additional start gcode:<input name="start" type="checkbox" onchange="toggle(!this.checked, '#firstlayerStart')" value="extraStart"></label>
+            <label>Add M80 to turn PSU on:<input name="psuon" type="checkbox" value="on"></label>
             <textarea id="firstlayerStart" name="startgcode"></textarea>
             <script>
                 if(document.firstlayerForm.start.checked == false){
@@ -240,6 +241,7 @@
             <h4>Additional start gcode</h4>
             <p>If you have additional start commands, tick the box and enter the gcode. This will be inserted after temperatures are set and homing/ABL is complete. This can be used to add a hot end purge command. For the majority of users, you can skip this section.</p>
             <label>Additional start gcode:<input name="start" type="checkbox" onchange="toggle(!this.checked, '#baselineStart')" value="extraStart"></label>
+            <label>Add M80 to turn PSU on:<input name="psuon" type="checkbox" value="on"></label>
             <textarea id="baselineStart" name="startgcode"></textarea>
             <script>
                 if(document.baselineForm.start.checked == false){
@@ -654,6 +656,7 @@
             <h4>Additional start gcode</h4>
             <p>If you have additional start commands, tick the box and enter the gcode. This will be inserted after temperatures are set and homing/ABL is complete. This can be used to add a hot end purge command. For the majority of users, you can skip this section.</p>
             <label>Additional start gcode:<input name="start" type="checkbox" onchange="toggle(!this.checked, '#retractionStart')" value="extraStart"></label>
+            <label>Add M80 to turn PSU on:<input name="psuon" type="checkbox" value="on"></label>
             <textarea id="retractionStart" name="startgcode"></textarea>
             <script>
                 if(document.retractionForm.start.checked == false){
@@ -794,6 +797,7 @@
             <h4>Additional start gcode</h4>
             <p>If you have additional start commands, tick the box and enter the gcode. This will be inserted after temperatures are set and homing/ABL is complete. This can be used to add a hot end purge command. For the majority of users, you can skip this section.</p>
             <label>Additional start gcode:<input name="start" type="checkbox" onchange="toggle(!this.checked, '#temperatureStart')" value="extraStart"></label>
+            <label>Add M80 to turn PSU on:<input name="psuon" type="checkbox" value="on"></label>
             <textarea id="temperatureStart" name="startgcode"></textarea>
             <script>
                 if(document.temperatureForm.start.checked == false){
@@ -974,6 +978,7 @@
             <h4>Additional start gcode</h4>
             <p>If you have additional start commands, tick the box and enter the gcode. This will be inserted after temperatures are set and homing/ABL is complete. This can be used to add a hot end purge command. For the majority of users, you can skip this section.</p>
             <label>Additional start gcode:<input name="start" type="checkbox" onchange="toggle(!this.checked, '#accelerationStart')" value="extraStart"></label>
+            <label>Add M80 to turn PSU on:<input name="psuon" type="checkbox" value="on"></label>
             <textarea id="accelerationStart" name="startgcode"></textarea>
             <script>
                 if(document.accelerationForm.start.checked == false){
diff --git a/js/acceleration.js b/js/acceleration.js
index 94ff143..8cc7fb8 100644
--- a/js/acceleration.js
+++ b/js/acceleration.js
@@ -1,4 +1,5 @@
 var originalAcceleration = `; G-Code originally generated by Simplify3D(R) Version 4.1.2
+;M80 ; power supply on
 G90
 M82
 M106 S0
diff --git a/js/baseline.js b/js/baseline.js
index f31b6d0..8bc78d5 100644
--- a/js/baseline.js
+++ b/js/baseline.js
@@ -1,4 +1,5 @@
 var originalBaseline = `; G-Code originally generated by Simplify3D(R) Version 4.1.2
+;M80 ; power supply on
 G90
 M82
 M106 S0
diff --git a/js/firstlayer.js b/js/firstlayer.js
index 7e948d9..475ce05 100644
--- a/js/firstlayer.js
+++ b/js/firstlayer.js
@@ -1,4 +1,5 @@
 var originalFirstlayerStart = `; G-Code originally generated by Simplify3D(R) Version 4.1.2, based on proposeed code by vector76
+;M80 ; power supply on
 G90
 M82
 M106 S0
diff --git a/js/gcodeprocessing.js b/js/gcodeprocessing.js
index 1b13481..09d846f 100644
--- a/js/gcodeprocessing.js
+++ b/js/gcodeprocessing.js
@@ -211,6 +211,9 @@ function processFirstlayer(){
     var firstlayer = firstlayerStart+skirts+squares+firstlayerEnd;
     firstlayer = firstlayer.replace(/G1 E-5.0000 F2400/g, "G1 E-"+retDist+" F"+retSpeed+" ; custom retraction");
     firstlayer = firstlayer.replace(/G1 E0.0000 F2400/g, "G1 E0.0000 F"+retSpeed+" ; custom un-retraction/prime");
+    if(document.firstlayerForm.psuon.checked == true) {
+        firstlayer = firstlayer.replace(/;M80/, "M80");
+    }
     if(document.firstlayerForm.start.checked == true) {
         firstlayer = firstlayer.replace(/;customstart/, "; custom start gcode\n"+customStart);
     }
@@ -328,6 +331,9 @@ function processBaseline(){
             baseline = baselineArray.join("\n");
         }   
     }
+    if(document.baselineForm.psuon.checked == true) {
+        baseline = baseline.replace(/;M80/, "M80");
+    }
     if(document.baselineForm.start.checked == true) {
         baseline = baseline.replace(/;customstart/, "; custom start gcode\n"+customStart);
     }
@@ -504,12 +510,14 @@ function processRetraction(){
     // F section
     retraction = retraction.replace(/;retractionF/g, "G1 E-"+f1+" F"+f2+" ; custom retraction - F");
     retraction = retraction.replace(/;unretractionF/g, "G1 E"+f3+" F"+f4+" ; custom un-retraction/prime - F");
-
+    if(f5 > 0){
+        retraction = retraction.replace(/;zhopupF/g, "G91\nG1 Z"+f5+" F1200 ; custom z hop - F\nG90");
+    }
+    if(document.retractionForm.psuon.checked == true) {
+        retraction = retraction.replace(/;M80/, "M80");
+    }
     if(document.retractionForm.start.checked == true) {
-        retraction = retraction.replace(/;customstart/, "; custom start gcode\n"+customStart);
-        if(f5 > 0){
-            retraction = retraction.replace(/;zhopupF/g, "G91\nG1 Z"+f5+" F1200 ; custom z hop - F\nG90");
-        }
+        retraction = retraction.replace(/;customstart/, "; custom start gcode\n"+customStart); 
     }
     downloadFile('retraction.gcode', retraction);
 }
@@ -637,6 +645,9 @@ function processTemperature(){
     temperature = temperature.replace(/temp3/, "M104 S"+c1+" T0 ; custom hot end temp - C");
     temperature = temperature.replace(/temp4/, "M104 S"+d1+" T0 ; custom hot end temp - D");
     temperature = temperature.replace(/temp5/, "M104 S"+e1+" T0 ; custom hot end temp - E");
+    if(document.temperatureForm.psuon.checked == true) {
+        temperature = temperature.replace(/;M80/, "M80");
+    }
     if(document.temperatureForm.start.checked == true) {
         temperature = temperature.replace(/;customstart/, "; custom start gcode\n"+customStart);
     }
@@ -808,6 +819,9 @@ function processAcceleration(){
         acceleration = acceleration.replace(/j5/g, "M205 J"+e4+" ; custom junction deviation - E");
         acceleration = acceleration.replace(/j6/g, "M205 J"+f4+" ; custom junction deviation - F");
     }
+    if(document.accelerationForm.psuon.checked == true) {
+        acceleration = acceleration.replace(/;M80/, "M80");
+    }
     if(document.accelerationForm.start.checked == true) {
         acceleration = acceleration.replace(/;customstart/, "; custom start gcode\n"+customStart);
     }
diff --git a/js/retraction.js b/js/retraction.js
index 105ad41..919b145 100644
--- a/js/retraction.js
+++ b/js/retraction.js
@@ -1,4 +1,5 @@
 var originalRetraction = `; G-Code originally generated by Simplify3D(R) Version 4.1.2
+;M80 ; power supply on
 G90
 M82
 M106 S0
diff --git a/js/temperature.js b/js/temperature.js
index 52106c1..ef6e122 100644
--- a/js/temperature.js
+++ b/js/temperature.js
@@ -1,4 +1,5 @@
 var originalTemperature = `; G-Code originally generated by Simplify3D(R) Version 4.1.2
+;M80 ; power supply on
 G90
 M82
 M106 S0