fischertechnik round spring cam (Federnocke rund)

Update Dec 6, 2021: added improved version v2. Print this with PLA as hot as possible (I used 235°) with as little cooling as possible, no overextrusion, and you will get a very stable and usable result.

A version of the conventional fischertechnik [spring cam (Federnocke)](https://ft-datenbank.de/ticket/1387) with a round knob for non perpendicular connections.

(now obsolete, see update)Be aware that the knob will break off quite easily. Use a bit of overextrusion (110%) to get a slightly