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The Counterintuitive Gear fidget
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a print-in-olace planetary gear with a double row of planets and counter-rotation (retrograde) motion
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Model information
- Source
- Printables
- Category
- Other Toys & Games
- License
- Creative Commons — Attribution
While playing with gear design again, I thought I could add a second row of planets (or are these moons?) to get some interesting behavior:
- If you lock the ring in position and rotate the sun gear, the planets rotate in the other direction around the sun.
- If you hold the sun gear steady and rotate the ring, the planets move in the same direction as the ring, but a bit faster than the ring.
Also try the little hand crank (or two) for a bit more fun →
If you liked this one, you might also like The Counterintuitive Gear MkII with more and faster planets.
Printing:
0.4mm nozzle, random seam placement, otherwise standard settings.
I also used archimedean chords top&bottom infill.
This is a print-in-place model, no assembly is needed, but a well-tuned printer.