Ender 3 Pro auto off with cool down - simple!

IF YOU INTEND TO MAKE THIS MODIFICATION, PLEASE READ If you're not competent doing AC electrical work by insulating conductors and routing wires, educate yourself! I've been doing DIY electrical, among other construction trades for decades. This is an easy improvement if you know how to safely work with simple AC electrical circuits. Essentially, this mod turns off the power to the power supply unit after the hot end cools. It is a simple way to shut off power to your Ender 3/Pro for very little cash. The Ender 3 would likely require a different design for the switch mount. There is a video where that was done and didn't require changing the bed bolt. Probably can be adapted to many other models of printer. All parts needed for this improvement are linked below. DISCLAIMER: If you aren't confident in your ability to accomplish this task, you can always try a less simple way to achieve a similar result. If you do this mod, please make a video, the safety nannies will then have someone else to nag and accuse of the destruction of all humanity. WARNING: If you do not possess the basic skills to: *Purchase a properly rated switch and wire (as described in video and linked below). *Disconnect all power while performing this modification. *Use electricians tools to cut and strip wires and to crimp or solder on connectors. *Safely use a lighter to shrink heat shrink insulation. *Safely route wires to prevent injury to yourself or damage to the wires themselves. *Finally, if you can't follow simple instructions, don't attempt this. There are plenty of videos to show you how if you're in doubt of your capabilities. All of this is based on ideas I've found in other youtube videos. I obtained the G-code changes from another video (see link below) and then remixed them so they would actually function. Below is the End G-code that I found useful for this to work as desired on my Creality Ender 3 Pro. It lifts the hotend after completion of the print and the fan continues to blow as it always does. The X axis does not move to the left as usual. After the hot end cools to 40C, it moves the X axis as usual and presents the print to the front and stops. It disables the usual 3 stepper motors as always. Below is the last paragraph and following line of End G-code in Ultimaker Cura 4.5.0 You can pass on what is already present in your machine settings and just enter the changes. Be sure to make changes to a COPY of your machine settings and give it another name. I used “Creality Ender-3 Auto Off” Inspirational video https://www.youtube.com/watch?v=XW2V_64BLLY _________________________________________________________________________________________________ G-CODE CHANGES The following can be entered into Cura 4.5 under printer name/manage printers/highlight printer name/machine settings/end G-code End G-code (last paragraph) AFTER THIS LINE: G90 ;Absolute positioning CHANGE THE G-CODE TO THIS: M106 S0 ;Turn-off fan M104 S0 ;Turn-off hotend M140 S0 ;Turn-off bed M109 R40; Wait for the hotend to cool to 40C G1 X0 Y{machine_depth} ;Present print M84 X Y E ;Disable all steppers but Z _________________________________________________________________________________________________ MATERIALS Needed Items: Micro switches (1) https://www.amazon.com/gp/product/B00W1VK9VG Screws (#4 x ¾ sheet metal screws to mount micro switch to base) https://www.lowes.com/pd/Hillman-4-x-3-4-in-Phillips-Drive-Sheet-Metal-Screws-22-Count/3034809 Washers (4mm below above screws, not needed with use of printable switch cover) https://www.lowes.com/pd/Hillman-10-Count-4-mm-Zinc-Plated-Metric-Flat-Washer/3012766 T-Nuts (2-4M or print from link in printables section below) https://www.amazon.com/gp/product/B0765Q7VFL Screws (2-4M x 8mm long to attach switch base to rail with T-nuts) https://www.amazon.com/gp/product/B074GZ9BRH Socket head cap screw (1-5M x 35 for micro switch trigger) https://www.amazon.com/iExcell-Stainless-Internal-Socket-Screws/dp/B07HDL3KVG Cord (about 2 ft of 18/2 lamp cord, I used black) https://www.amazon.com/GE-54435-Replacement-Polarized-Prong/dp/B000UTE278 Push connectors (minimum 3 female, 1 male) https://www.amazon.com/Baomain-Insulated-Connector-Electrical-Terminal/dp/B01MYV3BS0 Heat shrink tubing (3/16 diameter) https://www.amazon.com/gp/product/B00CFC5GSM __________________________________________________________________________________________________ PRINTABLES T-nuts https://www.thingiverse.com/thing:1686927 OR https://cults3d.com/en/3d-model/tool/t-nut-m4 Cable clips https://cults3d.com/en/3d-model/tool/ender-3-pro-cable-clips BE SURE TO PRINT AND INSTALL THE COVER OVER THE SWITCH AS SHOWN IN THE BEGINNING VIDEO SEGMENT Switch mount and cover https://www.thingiverse.com/thing:4291944