Fidget Spinner Planetary Gear System

Meshing gears for desktop fidgeting The perfect desk fidget for restless hands: grip the scalloped 41.375 mm outer rim and spin the 24-tooth sun gear, sending all six 12-tooth planets orbiting inside the 48-tooth ring. All 8 pieces print flat with a 0.35 mm mesh gap, so the gears free up with a single twist—no assembly, screws or bearings required.

A 3D-printable fidget spinner planetary gear system.

One push, six orbits Spin the purple sun gear and all six planets orbit inside the ring at once. The tooth counts are locked to a true planetary set: 24-tooth sun, 12-tooth planets, 48-tooth ring, with six planets evenly spaced so the mesh repeats cleanly all the way around.

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Herringbone teeth, printed flat. Every gear uses a 1.5 mm module and a 20-degree herringbone half-helix that meets at an apex halfway up the 10 mm face width. Opposed helices keep the gears axially centered while staying overhang-friendly, and a 20-degree pressure angle carries the tooth load.

Off the plate, already moving. It prints in place as one flat job: ring, sun and six planets, all sharing a 0.35 mm total flank clearance so the teeth free up straight off the plate. A 0.5 mm bottom chamfer relieves elephant's foot, and twelve scallops around the 3.5 mm rim give the grip.

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