Henry Segerman (mathematician and 3D printing guru) discusses how to make three gears work together.
More links & stuff in full description below ↓↓↓

Skew dice:    • Weird But Fair Dice (plus the D120) -...  
Check Henry's book about 3D printing math: http://amzn.to/2cWhY3R
Prime Numbers Playlist: http://bit.ly/primevids
Prime Machine:    • WARNING: Contains Numbers  

You can buy the gears from Henry at Shapeways: http://bit.ly/HenryGears

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Videos by Brady Haran

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