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3D Printing World

The Impossible Planetary Gear Fidget

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The Impossible Planetary Gear Fidget 3d model
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The Impossible Planetary Gear Fidget 3d model
The Impossible Planetary Gear Fidget 3d model
The Impossible Planetary Gear Fidget 3d model
The Impossible Planetary Gear Fidget - 8 hour print on a Sovol SV06 using a 0.2 layer height.
Eryone Grey PLA+ - 3d model
The Impossible Planetary Gear Fidget - Da Gears - 3d model
The Impossible Planetary Gear Fidget 3d model
The Impossible Planetary Gear Fidget 3d model
The Impossible Planetary Gear Fidget 3d model
The Impossible Planetary Gear Fidget 3d model
The Impossible Planetary Gear Fidget 3d model
The Impossible Planetary Gear Fidget - Printed at 75% on Robo 3D R2 using .35 nozzle with .075 layer height.  - 3d model
The Impossible Planetary Gear Fidget 3d model
The Impossible Planetary Gear Fidget 3d model
The Impossible Planetary Gear Fidget - Prusa MK3S+ at 0.15 mm layer height, 13.5 hours :0 - 3d model
The Impossible Planetary Gear Fidget - Prusa MK3S+ at 0.15 mm layer height, 13.5 hours :0 - 3d model
The Impossible Planetary Gear Fidget - Green is prusament lime green
Blue and black are hatchbox

Printed at .15 layer height on mk3s+ - 3d model
The Impossible Planetary Gear Fidget - Neptune 3 Pro, .15mm layer height, .4mm nozzle, works great :) Took around 10h-ish - 3d model
The Impossible Planetary Gear Fidget - worked perfectly with silk filament .. no change from standard settings.   had to force the gears a bit after printing but otherwise great work - 3d model
The Impossible Planetary Gear Fidget - The Impossible Planetary Gear in Magic Dual Color PLA - 3d model
The Impossible Planetary Gear Fidget - Awesome and easy! Prints in place - 3d model
This model is restricted by licensing terms. 
935 Likes3.1K DownloadsMarch 11, 2023
This model is restricted by licensing terms. 


This is a mix of the Impossible Gear Fidget and the Planetary Gear Demo. This fidget uses planetary gears, it’s a great way to better understand how they work.

Demonstration If you hold the carrier(middle gear) and turn the sun(top gear), you get at 3:1 speed reduction. This ratio is a result of the 36 teeth on the ring gear divided by the 12 teeth on planet gears. If you hold the ring(bottom gear) and turn the sun(top gear), you get a 1:4 speed reduction on the carrier(middle gear). The is because the much larger diameter ring gear is moving faster than the smaller sun gear. The equation works out to be the 36 teeth of the ring gear divided by the 12 teeth of the planet gear plus 1. If you hold the sun gear and spin the ring gear and the carrier, there is no reduction and it acts like a bearing

No supports!

Printed on the Mulcore


Support and Licensing If you would like to help support more free models please consider joining my Thangs Membership To get permission to sell physical copies of my models by joining my Patreon


935 Likes3.1K DownloadsMarch 11, 2023




This model is restricted by licensing terms. 
935 Likes3.1K DownloadsMarch 11, 2023
This model is restricted by licensing terms.