In this video I run through the design and build of an add-on for my DIY Prusa i3 MK2 3D Printer that controls the supply of power to the printer’s two power supplies.

I wanted to add this for two reasons. Firstly I wanted an extra layer of security in case any of the electrical components failed in a catastrophic way leading to over heats, particularly the power supplies as I doubt their quality based on the budget prices. Secondly I wanted to be able to add G code (M Code actually) to my prints so that once the print it finished the printer is shutdown, including the power supplies.

More details in the video, but as discussed here is the schematic:

Arduino Power Control Schematic

I also mention that I am now using Sublime Text instead of the Arduino IDE. I use Sublime Text on a daily basis and it has a lot more editing features than the IDE. When I found this brilliant add-on package for Sublime Text, called Stino, that brings Arduino syntax highlighting, compiling and uploading directly from within ST, I switched instantly. Even if you don’t already use Sublime Text – it might be worth it just for this!

Finally, if you really want to you can download my source code for the project – as it stands at this point. As explained in the video it is very much an evolution from a basic idea – so isn’t that well written. But it does the job.