Planetary Gear Puzzle Box

Not much of a puzzle, really. Just turn the knob. Demo of a gearbox concept: https://www.youtube.com/watch?v=_fb97PWaaFY

Print in place, fully assembled, no supports. Just be sure to have your tolerances dialled in and your slicer preserves the one-layer gap in the outer ring gears. After printing, remove core and separate ring gears with something sharp like a spatula or razor blade.

Update: Increased tolerances from initial version. Should print fully assembled but I'd still recommend pr