Prusa Research MMU2 improved roller

thingiverse

The Prusa MMU2 comes with five spool holders, but I discovered that the friction on these spools was significantly higher than my custom-made rollers had been. I believed minimizing filament friction would be essential to making my MMU2 a success, so I created a modification. This mod utilizes the same aluminum rod and bearings as before, coupled with new endcaps and an 85mm section of 1-inch Schedule 40 PVC tubing. As a result, static resistance has been reduced by around five to eight times. It worked!