3-in-1 spool holder
thingiverse
This holder accommodates frequent filament spool sizes: 48mm, 38mm, and 32mm. Spools can rotate freely on an 8mm shaft within it. It's usable as is or with added 608 bearings at one or both ends. For printing, set the layer height between 0.4-0.5 (not crucial), and use support. Removing support post-printing can be difficult without it, so bear that in mind. If necessary, clean the internal hole with an 8mm drill to ensure a 0.2mm clearance around the shaft. Place a 608 bearing inside using a vise and some plastic pieces for protection against marking.
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