Bigger! More planets! Faster planets! Even more counterintuitive!
You probably have played with some planetary gears, they are cool stuff, especially those print-in-place herringbone ones. This “Counterintuitive Gear” model however has a double row of planets, which lead to some counterintuitive behavior:
| Â | normal planetary gears | counterintuitive gears |
| When you hold the ring and turn the sun gear, | the planets move in the same direction. | the planets move in the other direction. |
| When you hold the sun still and turn the ring, | the planets move in the same direction, but slower than the ring. | the planets move in the same direction, but faster than the ring. With MkII's bigger sun gear the planets move even faster, nearly 2 rotations for one ring rotation. |
The hex holes should fit regular hexagonal pencils or the hand crank (I suggest using more than one).
The MkI (with smaller sun) can be found here.
Printing:Â
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.
The Counterintuitive Gear fidget MkII
by DrJones · original on Printables ↗
Learning / Engineering
♥ 214⬇ 1.8k🖨 23 prints
Print profiles
counterintuitive-gear-mkii.stlDEFAULT
⏱ time and weight estimated after preparation · 1 material(s)
Made to order: we prepare this file when you order, which adds a few minutes before printing starts.
Prints on: A1 mini 0.4PLA
Order this print
counterintuitive gear mk2 chamfered.3mf
⏱ time and weight estimated after preparation · 1 material(s)
Made to order: we prepare this file when you order, which adds a few minutes before printing starts.
Prints on: A1 mini 0.4PLA
Order this print