Ender 3 Pro rear mounted Raspberry Pi 4 case ( T-Nut free ) by relativeinspire

Last crawled date: 3 years, 4 months ago

I did a remix of the popular enclosure by Teaching Tech because it didn't required T-Nut to fix it to the printer and I only needed the left part for the Raspberry Pi. I also preferred the fan blowing under the unit.
It has enough room for the 30mm fan, the step down power supply module (24v -> 5v), 2 relay on the back and the Pi 4.
UPDATE 2020-12-24
I'm quite deceived by the performance of the LM2596 DC-DC buck converter. Yes it cheap ( 5$ a piece on Amazon) but I had to crank up the voltage to 6V to keep up with the current required by the Pi. The symptom is easy to spot, the red led on the board turn off as soon as the power source cannot keep up with the load. I'm also powering a web cam so the step down from 24v to 5v with the current required seems to much for this hardware, even though it's rated at 3A!? There is no way that board will deliver 3A @ 5v from a 24v source.
And after a couple of print run, I also notice some strange flicking on the LCD screen. So I'm pretty sure the buck converter is the culprit. I did some research and instead decided to go with a more robust solution for DC-DC converter and opt for the DTJ1524S05 from XP Power (43$ on Digi-Key). I added new support post for this board (V2 version). It fit over the relay section at the back but I was not using it anyway. If your really need relay, simply swap it to where the LM2596 was sitting before.
I also made the lid 1.5 mm larger and add a small slot in the case so it support it all the way to the back.
That's it!