MMU2S extruder filament sensor micro adjuster

thingiverse

Update: There two versions. Newer machines printed after February 2021 should use the 2021 version. Older models use the other. I found it very difficult to set the very sensitive extruder filament sensor for the MMU2S multi-material accessory. I would get it set perfectly but as soon as I tightened the bolts it would be off. Shifting it the tiny amount needed to compensate for this movement was very difficult. This is a modification of the OEM part which simply adds a slot for a square nut and 20mm screw. This allows you to set the alignment very consistently. If you need to adjust, you just loosen the bolts, turn the screw a half turn in the desired direction, snug it up, and re-tighten. It made a world of difference for me. It is also very easy to install. Only three screws to remove to swap it out. I also elongated the slots a little to give more room to adjust for any drift that may happen over time.