Ender 3 all in one rear electronics case with 2 40mm fans in the back

thingiverse

I modified surenz's OrangePI box to fit regular Ender 3 (Pro) electronics. I used a BTT SKR mini E3 in my case and a Raspberry PI 3B+. The design has two mounting places for LM2596 DC/DC converters and one place for a proper 30A relay YYG-2. I redrew the whole design in OpenSCAD because surenzes STEP files gave me trouble. If you're comfortable with SCAD, feel free to modify the design to your needs. There are two versions of the left box; I use the one with an extra cutout above RPi for a cable bundle going to my DDE. The right lid has a smaller cutout because I didn't need it bigger. You can use two 40x40x10 fans at 12V or 24V. If you're using 12V, just wire them in series. For now, I'm using original Ender's 3 24V fans with extra resistors to reduce speed and noise. Most likely, I'll replace them with Noctua or something similar in the future. The right fan is blowing in, while the left one blows out. The airflow is fantastic. My motor drivers aren't heating up much, and my RPi is 40degC under load (with no cooling, it went up to 60degC). Regarding wiring, I use a 30A relay to switch the controller board because current during heatup exceeds 15A easily. To improve safety, I have an in-line fuse (1A) at the input of the DC/DC converters. That cabling and electronics could burn with a 300W power supply if a short occurred.