Prusa filament spool roller
thingiverse
Simple roller for the filament holder on a stock Prusa I3-MKS. Allows the spool to roll much more smoothly and helps eliminate rocking and swaying on the frame. Print 1 housing, 1 endcap, 10 bearings. Slide housing onto the filament holder. Insert bearings into the housing. Slide endcap onto the end of the housing with a press fit. Profit.
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