You can imbed this into your designs to have a place to mount a Pi camera with four tiny screws. Tested with my 8MP NOIR camera, fit snug, actually snapped into place, so you may want to widen the channel by 0.1mm on either side if you want easier insertion/removal. You can print out just this model to test the fit before printing something more complicated that contains it.

PiCamMount2 file is 30.4mm tall, designed to center the lens as close to 15mm up from the bottom as I could. This one is as yet untested.