This is an arm to mount a Raspberry Pi camera to an 8 mm (acrylic) print bed. I use it on my GeeTech i3 pro C, but it should fit lots of other models as well.
Although it is a bit loose, and i had to fix it with sticky tape. (Yes, the tape’s a pun and says »Zusammenhalten«, that is, “stick together”.)

This works great with OctoPrint (and OctoPi). It gives great time lapses with the printed object stable when you have a moving print bed.

Combine this with the upper parts of Daniel Bull’s Raspberry Pi camera mount. The mount is not included because of incompatible licenses. (Somehow the link does not work, but i am speaking of thing number 239268 “over there”.)

I added the OpenSCAD file, so people can change the sizes, e.g. for thinner beds.