A desk top demonstration of Planetary Gears, this is printed ready assembled, and due to the shape of the teeth, stays together. Fun to show off what 3D printing is capable of, and to fiddle with when deep in thought
Here is an animation of the three ways a Planetary Gearbox can rotate that I produced in 3ds Max using the same mesh.
Diameter is 46mm
If you would like your own copy, it is available here.