I use Overture and Sunlu filaments, so I made a spool holder that will fit both.

After printing, add (2) 608 bearings to each corner, and secure with a 3/4" long 1/4-20 screw (see picture).

You will need (8) 608 bearings and (4) 1/4x20 screws or bolts.

If you use spools even smaller, just stack bearings and attach appropriate length 1/4x20 bolts, even to the point of 11 bearings per axle using a 75mm threaded rod.

I just happen to have a (edited) -large amount- of 608 bearings, so I use them everywhere.