It is a model or a planetary gear set.

Speed ratio = 6

Hold one hand with your left hand, and use the center part of your right hand to rotate the other hand quickly

I'm going to print it out:

• 3 cycles
• A spacious bottom and top surface
• 20% three-dimensional honeycomb
• Not supported
• Without a brim

But maybe we can print it with the default parameters

You need a few drops of Cianaraillate glue to assemble it