Filament Spool Holder Bearing Cover
thingiverse
These are bearing covers you can glue over 608RS bearings. Put as many as you want on them on two 8mm rods to sit your filament spools on top of. You can use spacers to separate them so they don't touch the other roles and spin them. Use a few dabs of (super) glue to make sure it doesn't come apart. Usage example: https://buildcomics.com/hero/3dp-a-new-hero-and-its-home/
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