3030 1/4-20 UNC Camera Mount (like C920)

This is a remix to use a different no-hardware mounting piece to the 3030 frame and to have a simple 1/4"-20 UNC screw thread to mount cameras like the logitech C920.

Note: while these two pieces added on seemed to work, I had some challenges with the original print (3030 Extrusion Pi Camera Mount) printing in PLA; I think it needs the extra strength and flex of PETG. It took too much force to get the pieces to fit together and ended up breaking most of the time in PLA. When I used some warm