This is a remix of BoomZilla1 608 extra tights bearing. I added an outer ring which should fit most of the filament spools out there.
https://www.thingiverse.com/thing:2746804
You might need some tools to get it running for the first time. I made good progress with moving them up and down a bit and then cutting with a sharp knife between the 'balls'. A dremel like tool works magic for amoothing the internal, just let the bearing spin around a bit.
Printed on my Prusa Mini+. Also published on thingiverse before https://www.thingiverse.com/thing:4839822
The author remixed this model.