This model by jofeinmechaniker is one of the best mechanical models I’ve printed in 14 years of modelling and printing. It inexplicably has less than 200 downloads and only 2 makes as of this post. It prints easily, turns smoothly, and makes an excellent desk display. Please check out the design and give it a download and make if you appreciate the designer’s work.
Inspired by that creator’s work, I experimented with excellent Belfry OpenSCAD Library (BOSL2) that easily extends and multiplies the power of OpenSCAD. This shape is a variant of a bevel gear and has very interesting characteristics. I’ve been contemplating making a version of this with 3, 4, 5+ bevel gears.