Prusa MK2 Multi-Material MMU Idler screw gauge

thingiverse

This is a simple little gauge that snaps over the springs on the idler screws to aid setting the proper distance between the washer and the idler printed part (4mm-5mm according to the assembly instructions). The gauge is 4.5mm wide, but measure it after you print it just to be sure. I have found that setting this distance accurately makes a noticeable improvement in the quality of prints on the MMU. Especially at higher print speeds. Hold in place and gently tighten the idler screws evenly until the gauge is just barely pinched between the washer and printed part. Once the distance is set, DON'T FORGET TO REMOVE THE GAUGE! SET WITH NO FILAMENT IN EXTRUDER. < This is based on Prusa instructions, but mine seems to like being set WITH filament in the extruder.