Ender 3 all in one rear electronics case - Orange Pi Zero edition

thingiverse

Remixed from TeachingTech's rear case but adapted to fit an Orange Pi Zero H2+ instead of a Raspberry Pi. My version is intended for those who want to update their stock motherboard with a drop-in replacement such as the SKR Mini E3 or the Fysetc Cheetah so they won't need to print a new right case a second time. Instead of using TLSmoothers, I added fittings for another fan and a buck converter on the right case. Also, on the left case, there's room for three relays and two buck converters (even though I'm pretty sure you won't need that many electronics). The right lid has two air intakes exactly above the stepper motor drivers. The fan should be able to suck in air and blow hot air below. The left lid has a fan to cool down the air inside because the Orange Pi Zero runs a bit hot, which is why I carved a squared hole exactly below the OPZ CPU to achieve some more cooling. The right case has an additional hole in the front because I want to use a custom-made USB cable going out from GPIO pins. This way, it's cut to the perfect size to reach the mini-USB port. You can put everything together using M3 screws: * M3x6mm for relay, buck converter, Orange Pi * M3x20mm to hold the two parts (right case, left case) together * M3x8mm + M3 washer if you want to hold down the two lids using the front hole. Use the washer to ensure more grip. My wiring is a little different from the usual just because I want to be able to exclude OctoPrint from handling my printer in case my Orange Pi Zero will fail. To do so, I derived two wires from the Ender 3 PSU (it has two 24V outs available!) and connected them to the relay handled by OctoPrint (plugin OctoPrint-PSU-control). Instead, I plugged the stock XT60 connectors directly to the motherboard passing through a switch. This way, I didn't even have to cut the original wires, making the whole mod completely reversible. If you need my wiring diagram, just let me know in comments. A SKP file is included if you want to remix this. I plan to add a small OLED display on the front just to show some stats about the Orange Pi, such as RAM/CPU usage and processor temp. I also ordered from AliExpress the Fysetc Cheetah 1.1 so I plan to install it in the future: the cool thing is that it comes with an USB debug plug so in theory I should be able to use it as a standard USB connection.... But I'm not sure if it would work, seems too good to be true.