Minimalistic spool roller.
thingiverse
This device securely holds a spool for free movement and filament feeding. Its single-piece design fits snugly on a cupcake platform. Requires four bearings with matching screws; choose from various sizes using the parametric design. The STL is tailored to MBI spools (74mm width), but other sizes may be used after measuring your own spool. A printed example is from protoparadigm, needing a 76mm width adjustment.
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