The two identical halves snap together to hold three M10 nuts and one regular 608 skateboard bearing. You can switch around with loads of different colours if you just keep printing :)
This was a modeling exercise for me, as I am still quite new to the game. It came out pretty nice though I think.
ENJOY!
https://www.youtube.com/watch?v=bVGWnfAMMq0
Printer:
Monoprice Select Mini
Rafts:
No
Supports:
No
Resolution:
0.15
Infill:
100%