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 printing core and shell separately for smoothest finish which is important for sliding.

Updated math, verified by reality...

Gear ratios relative to top (fixed) gear: (formulas included in scad)
P1 P2 R1 R2 S1=2P1 S2=2P2 Gear Ratio
8 5 34 20 16 10 1:50
8 6 34 23 16 12 1:28.75 (4:115=5x23)
8 7 34 26 16 14 1:21.6667 (3:65=5x13)

We can forget the fractional turns, since it must at least be a multiple of 50 (a whole number) giving us a lowest common multiple of 50x13x23 = 14950

So that