After many iterations and prototypes of other designs, I ended up on this as my final solution for mounting a Pi camera to the Pi Zero W that's attached inside of my Prusa i3 MK3.

I wanted something that required no new mounting holes at all, and worked to extend onto the holes that were already present from the Prusa-designed Lack enclosure.

I took the dimensions of the front-right leg piece, replicated that and added the ball joint mounting system from baloan's camera mount design, and finished it off with ibandreas Pi camera case itself, modified to fit for the ball joint from one of my previous designs.

I uploaded two different Pi case backs, one for the cable to come out of the top, and the other for the bottom to fit your specific needs. This part at least must be printed with supports enabled so the ball joint area works nicely.

After you have all parts printed, just unscrew the existing screws and line this up over it and screw them back in, and add the ball joint to the end of the arm sticking out and pop your camera on top!

Video: https://youtu.be/q79lumAvM6k