Stacked Knob Planetary Gear Fidget Toy
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A planetary gear fidget toy with stacked knobs for the ring gear, the carrier and the sun gear.
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Informacje o modelu
- Źródło
- Printables
- Kategoria
- Other Toys & Games
- Licencja
- GNU General Public License v2.0
A typical 3D printed planetary herringbone gear fidget toy, but with the ring gear, carrier and sun gear extruded to three stacked knobs.
I saw something similar to this in a video online, but couldn't find the source model. Bored and in need of a weekend project, I decided to try to make my own implementation from scratch, which involved both learning to make herringbone gears in Fusion and designing a planetary gearbox.
The sun and planet gears all have 10 teeth, and the ring gear has 30. This works out to a gear ratio of 1:3 (technically -1:3) if you hold the carrier knob (middle one) and rotate the ring gear knob (on the bottom, with the gears inside), causing the sun gear knob (on the top, with the spiral pattern) to spin three times as fast (in the opposite direction). If you instead hold the ring gear knob and rotate the carrier knob the gear ratio is instead 1:4, causing the sun gear knob to spin four times as fast (in the same direction).
Print settings
I've only tested this with a 0.4mm nozzle and 0.2mm layer height, so that's what the tolerances are tested for. PLA is recommended (PETG works, but causes more friction). Other than that, most anything goes. Print with the gears facing the bed, no supports needed.
Infill is basically only needed for the top layer, and you can save a couple of minutes of print time by using Adaptive Cubic infill (even more so with Lightning infill, but I haven't tested that myself).
Using random seam placement can reduce chances of the mechanism binding, but I haven't had any issues with aligned seams (the default) in my tests.
Tolerances
I added (2024-06-26) a secondary version with tighter tolerances (less play in the mechanism). It printed in PLA without issues on my MK4, and came of the bed with barely any initial binding (printed with random seams). Not sure it would work as well on all printers, and I doubt it would work well in PETG. The original, looser version tends to spin more freely, but it's also a bit sloppy at times.