Planetary Gear Fidget – Print-in-Place Herringbone Gears, Real Involute Teeth, No Supports | STL

A satisfying print-in-place planetary gearbox fidget that comes off the bed assembled: knurled ring gear, sun gear with a hex finger dimple and 3 planets. Spin the sun or the ring and watch everything turn. 65 x 65 x 10 mm. WHY IT TURNS SMOOTHLY: real involute teeth (20 degree pressure angle, module 1.6: sun 12, planets 9, ring 30) instead of rough approximations, with about 0.25 mm working gap at every mesh - checked digitally through a full tooth of rotation. The 30 degree herringbone (V) tee…

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