Remixed from TeachingTech's rear case but adapted to fit an orange pi zero H2+ instead of a raspberry. My version is also 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 TLSmoothers I added fittings for another fan and a buck converter on the right case, also on the left case there's room for 3 relays and 2 buck converters (even if I'm pretty sure you won't need so many electronics, but still...)
Right lid has 2 air intakes exactly above the stepper motor drivers, the fan should be able to suck air inside and blow hot air below. Left lid has a fan to cool down the air inside because the orange pi zero runs a bit hot, that's why I carved a squared hole exactly below the OPZ cpu to achieve some more cooling.
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 is cutted 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 2 wires from ender 3 PSU (it has 2 24V outs available!) and I connected them to the relay handled by octoprint (plugin Octoprint-PSU-control).
Instead, I plugged the stock XT60 connectors directly to the motherboard passing from a switch so this way I didn't even had to cut the original wires, by making the whole mod completely reversible. If you need my wiring diagram, just let me know in comments.
skp file 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 standard usb connection.... But I'm not sure if it would work, seems too good to be true.
obviously you have to enable supports only for both left and right front panel windows