After looking at all the pi camera mounts out there, I wanted to design one based on a ball-socket mount for better positioning.  This needs to be printed at .1mm layers or better to get the fine pitched threads to be clean on the tightening nut and ball socket part.  I printed this in Ngen, and hit the threads with a quick spray of silicone.  3 number 4x .375 screws hold the case-halves together, and the pi board sits on some posts and recesses built into the front housing and is trapped by the back housing.  To eliminate supports, the ball part is threaded into the case back.  If you want, you can merge the back and ball together.