Harmonic Drive 30:1 for NEMA17 - Printable Strain Wave Gear, TPU Flexspline, 623 Bearing Rollers

A real strain wave (harmonic) gearbox that you can print and bolt onto a NEMA17 stepper. A thin TPU cup with 60 teeth is pushed into a slight oval by four rollers. Its teeth mesh with a rigid ring of 62 teeth at the two ends of the oval. Every motor turn walks the cup back by 2 teeth, so the output turns 30 times slower, the opposite way, through a big orange output flange. Diamond windows in the housing let you watch the translucent cup at work. Every part prints flat without supports. **How i…

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