A simple spinner made out of 3 parts so that they can be printed in different colours.
I've printed it with Bambu PLA on generic profiles (0.4 nozzle). No support or brims needed.
The nut part has a chamfer on the one side only. The thread does not go all the way through to make the bottom surface look smoother when the bolt and nut are assembled together.
Assembly is simple:
Screw the spinner (cross) onto the bolt. Then screw the nut onto the bolt with the chamfer side on the nut's thread, going on first onto the bolt. I've glued the nut in place on mine, but it is not needed.