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Pericyclic or nutational gears/transmissions typically consist of 4 bevel gears and thanks to their nutational motion, they provide extremely high gear ratios while also ensuring a high tooth contact ratio. This allows them to transfer high torques smoothly, making them competitive compared to other traditional gears. In this video, I discussed 3D printed pericyclic/nutational gears, their designs, working principles, and issues.

STL files: https://www.thingiverse.com/thing:668...