This was inspired by:

https://www.myminifactory.com/object/3d-print-giroscope-71880

Unfortunately I couldn't get it to print properly on my printer, so I designed something similar from scratch in OpenSCAD.

This model should print flat, without supports or rafts. Once removed from the bed all rings should rotate freely.

The parameters in the .scad file should be pretty self-explanatory. The clearance between the parts is adjustable via the "clearance" variable in the file (increase clearance slightly if you have issues with the parts sticking together). The other parameters determine the overall dimensions of the piece and the number of rings.