Changes I made to the existing design from fablab-berlin:
made the flap that connects to the camera thinner, in order to mount it between the camera and a stand plate.
Enlarged the radius of the cap so it fits tighter.
did not pay a lot of attention to the shape itself.
after I look at it I liked the original better, but it does the job.
Rigidbot controlled by octoprint sliced with cura printed at .1 mm