Anti-vibration foot for M4 screw

Mount this foot to any element using an M4 screw, place a 40mm diameter squash ball in the socket, and enjoy greatly reduced vibration transmission to the floor.

Print it the right way up with supports. The supports can be quite difficult to remove from the top part as the space is pretty close, but do it slowly and gently and they come out in the end.

Edit 2022-04-29: The foot.stl was a bit weak (could not drag the printer on a surface, the top part would break immediately) so I added a stronger version (foot-strong.stl / scad) which I recommend now.