608 bearing pulley
thingiverse
A pulley uses 1 x 608 ball bearing. You can use it with 1..6 mm rope. I thing it's good idea to make universal filament spool holder with 2 8 mm horizontal pins or shafts and 4 pulleys for each filament spool. It is actual if you have a lot of filament spools in line. WARNING! You must to pause the printing and drop the bearing.
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