Spool holder with filament loop

I needed spool holders but I wasn't happy with any of the existing ones. I was inspired by the "Super Simple" https://www.thingiverse.com/thing:2165694 using ball bearings.

(https://www.kugellager-express.de/miniatur-kugellager-608-zz-8x22x7-mm)

This has five different parts (17 total parts) but the **only non-printed part is the ball bearing**. (It's probably possible to print a wheel that doesn't need a ball bearing but I haven't experimented with that.)

The wheel clips and wheels nee