All generators › Gears and drives
A casing with teeth inside, and the gear that runs in it.
Set the outside size of the casing and the number of teeth, and get a ring gear with the teeth on the inside. Add an inner gear and it is shown in place, with the shaft offset worked out.
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Spur, helical and herringbone gears with real involute teeth.

Two gears that mesh, from the shaft spacing and the ratio you need.

Sun, planets, ring and carrier that fit your casing and ratio.

A gear set that comes off the bed already assembled.

A strain wave gear with a printed flexible cup.

A harmonic drive that uses a timing belt as the flexible part.

GT2, HTD, XL, MXL and T-series pulleys with any tooth count.

Roller bearings that print already assembled.