Ender 3 Pro PSU case with USB

thingiverse

I wanted to add a Raspberry Pi running Octopi (OctoPrint) to run my Ender 3 Pro, and you can see the pictures in Crowser's remade case at https://www.thingiverse.com/make:573845. I decided the pi should run off the Ender 3's PSU, so I went for a USB powered route instead of hard wiring a buck converter. I used this buck converter - https://www.amazon.com/gp/product/B07121W7Q4/ - and others would probably work just as well, looking for 3A (5V) USB out that could use 24V input. If you don't get 3A output, the pi will probably complain about being underpowered, like mine does if I use a 2.1 power supply. I wired the buck converter to connect directly to one of the unused 24V pairs on the PSU, and the USB power connection is at the back of the PSU case. To make sure my mounting mechanism for the buck converter worked, I created a test print - you could use this to quickly test or adapt for a different buck converter. Once that seemed to work, I incorporated it into the PSU case. It's not perfect: one of the clamp prongs snapped on my full print, but I made it work without reprinting the whole thing. For the PSU case, I followed the original design pretty closely, putting the buck converter mount on the bottom at the back. To make sure there was enough room, I deepened the whole case by 5 mm. There didn't seem to be any way to print it without supports, unless I changed the design significantly. I used Cura's Conical Support (experimental), which worked well. I included Sketchup files if you want to edit them.