Added bearing, however it seems like printing vertically of the outside is a bad idea
(obvious..)
Those little pegs that are supposed to click dont work.  I should have known.
Also it doesnt rotate well, i think the small size of the inner made it too hot during printing causing sag,
making it bigger for that reason.
recursive tree and some cups based on it
Maraca, openscad wont make a proper .stl :/