This is in internal hub without bearings that prints without support. It's for a project I'm working on, but it's fun to print and it spins pretty nicely right off the bed.

I printed it with minimal infill @.1, and 2 bottom shells, and 3 top shells. Layer height .3 was fine.

I'm including the sketchup file so you can modify it. It could run a printer spool or anything you like.