My spool holder (see remixed from) had the issue, that the 608 bearings have very low friction. On some movements the spool turned to far so that the filament got loose and sometimes it even jumped off the spool.
This design uses axial bearings which get pushed from the sides to the spool holder. This generates the right amount of friction to prevent that the filament get loose but doesn't drag much on the filament.
You'll need besides the prints:
(Imported from https://www.thingiverse.com/thing:3012614)
The author marked this model as their own original creation. Imported from Thingiverse.