Nema 14 Harmonic Drive

15:1Harmonic Drive using a TPU printed spline.


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Latest Iteration: 1.0 (Alpha) [26 Aug 2020]

About the Harmonic Drive

This design is for my T^2 Tile project. Harmonic drives, featuring no backlash and unable to be back driven, were two very useful features. The mount has 32 teeth and the tpubelt has 30. The Output also has 30 teeth.

The M5 holes are 38mm square apart.
Drive size is 52x52x48.5mm and the minimum rotation avoiding it is 64.5mm.


  • 693 or MR83 bearings x4
  • F8-M16 thrust bearing
  • 6806 Bearing
  • M5X60mm bolts x4
  • M3X12mm screws x2
  • M3X20mm screws x2-4 for Nema 14
  • M3 Diagonal Grove Brass Inserts x2
  • Nema 14 Stepper
  • M4 Lock Nuts

FIle Notes

  • Step and f3z files for modification
  • Supports needed for Output.stl

Materials and methods

PLA for everything except the TPUBelt.



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Mini candiroyCandiRoy added this to the zxdfg collection ago
Mini dotsnov21 w ckelvinA created issue Task: Print and test design ago
Mini dotsnov21 w ckelvinA commented ago

Added Alpha Branch: 1.0

Mini dotsnov21 w ckelvinA published this design ago