There are quite a few raspberry pi 4 enclosures around, including a few for the Ender-3 V2, but none of them had exactly all the things I was looking for, so I made this! I wanted an enclosure that:

1. Didn't increase the footprint of the printer (so that rules out mounting it on the side)
2. Had the option of adding a fan if required
3. Had plenty of ventilation for the pi
4. Fitted the raspberry pi 4
5. Had slots for all the cables (printer USB / power / ethernet / pi cam) and kept them as invisible as possible
6. Didn't require any tools / screws / bolts etc

I never used the drawer in my printer and there were a few examples of other designs that replaced the drawer with a space for the raspberry pi. This ticked the "don't increase the printer footprint" box - so I based by design around this.

Why add a raspberry pi?

I initially added a pi to my setup so I could run octoprint and submit jobs remotely (I am far too lazy to keep ferrying an sd card around!). However, on top of this, there is also a bunch of extra stuff you can do with this kind of setup:

1. Submit and monitor jobs remotely with octoprint (I originally used this guide)
2. Add a pi camera and watch your jobs from your phone / octoprint web interface
3. Install Klipper and make use of your Pi's processing power to speed up and improve your prints. There is a good guide on reddit for setting this up on the V2.

Fans and ventilation

The raspberry pi 4 runs a little hotter than the older Pi's so may require ventilation to prevent it throttling (it will throttle above 80C). This design adds quite a few ventilation holes around the pi to try and alleviate this.

There is also a cut out in the box to mount a 40mm fan if required. I have so far found that I haven't needed this; the stock MCU fan pulls enough air through to cool everything enough (the holes in the side of the box line up with the holes on the MCU enclosure).

Other similar designs

In my search for a solution for housing my pi, I came across a few other options. If my design doesn't quite do what you want, one of these other ones might!

• Improved Ender-3 V2 Replacement Drawer for Raspberry Pi - Only replaces the removable drawer instead of the entire enclosure and exposes the pi ports on the front of the printer
• Raspberry Pi Octoprint Drawer for Ender-3 V2 - BitBangLabs - Alternative 'draw only' design with space for an on/off switch and fan
• Ender-3 V2 Raspberry Pi Case - Full drawer enclosure replacement with space for a buck converter
• Ender-3 V2 Drawer - Full drawer enclosure replacement which also includes cut out for original ender 3 v2 screen on top
• Ender-3 V2 Drawer - generics14 - Remix of the one above that adds a tool compartment at the front and some other improvements. I used this one as reference for the measurements of my design.
• Ender-3v2 - All in one undercarriage - Allows you to keep the original draw and mounts underneath it, as well as providing a space for a bigger MCU fan. Requires raising the printer up.

I am sure I have missed some, so feel free to ask me to add to this list!