Free 3D-printable models designed by Zheng3
Tinkeriffic Gear Train

Tinkertoy-compatible.

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Original blog post: Switching Gears

No assembly necessary. Just print and play.

The bores on the gears should be a snug fit on a 1cm shaft, but not so snug that a child can’t easily attach and remove them.

A piece of sandpaper or masking tape will help adjust the bore and dovetails to the desired tightness.

The gears have 32, 16, and 8 teeth, respectively. Computing gear ratios is left as an exercise for the reader.