A 2-in-One fidget spinner. Spin both parts one way, or the other way, OR counter-spin them!
You need 2 quality 608ZZ bearings for the hubs (I used ceramic Freeport SpeedDemons which I got cheap in a Black Friday Amazon sale) and 4x any old rubbish bearings for the rotational weights.
Print in one colour, or slice and print all the parts separately for a multi-coloured Counter-Spinner.
NO GLUEING - printed screw fit parts and push-in parts only!
NO SUPPORTS and NO BRIM - Just print at 0.16mm layer height, with 4 wall loops and 50% infill for strength.