Butter-smooth filament spool
thingiverse
Uses the same 608 ball bearings as the prusa mendel. Youtube demo: http://www.youtube.com/watch?v=cpqRnmOveK8 Instructions Run an 8mm threaded rod through the spool. Enclose spool on both sides with printed hub. Place washer and nut configuration on both sides and tighten. Enjoy zero drag!
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