This is a Raspberry Pi camera mount for the Ender 3. I designed it to mount under the control panel for a compact fit. I wanted to use a short ribbon cable and make it as small as possible.

The design requires four bolts, I use hex, but others of the same size will work. The tolerances are tight because each bolt will tap the plastic.

The sizes I used are:
4 M2 X 6mm hex
1 M3 X 20mm hex

I also designed it to fit under with a back panel plate but it will also work with the OM bolt on the back panel if no plate is on.