Recirculating ball spool holder (RBSH)
thingiverse
Update November 25, 2019: Added a bit more play in the bearing for better performance without adjustment. This spool holder is attached to the chassis of the MK3 Prusa exactly as it was originally. It keeps the plastic roll secure by preventing nodes from forming around the axis of the support. No ball bearings are needed; instead, the bearing relies on a 6mm soft-ball recirculation system. Only two parts need to be printed for each support. 3MF Prusa slicer project files are now available online. https://youtu.be/ZZHaaujGAA0
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