3D printers are not designed to be used as a marble machines. Do not try this at home. 😉
(*May need some hot glue to work*)
Probably not the best for your 3d printer. (But I think it's pretty cool)
3D Printer: Ender 3
https://amzn.to/3snsGo8
I recommend these filaments:
Copper Filament: https://amzn.to/2MiLdCK
Multi-Colored Filament: https://amzn.to/3umMxWB
Black and White Filament Combo Pack: https://amzn.to/37IDFk9