I designed two major versions of harmonic drives. One is smaller and meant to go on a Nema 17 stepper motor. The other version is larger and has two hubs so that any sort of motor or pully can be attached. For each of these versions, I designed them with two different reduction ratios. These gearboxes are simple to print and can be used in a wide variety of projects. Below is a link to a video showing how to put them together as well as a link to the files.
Video:
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