Prusa MK3S MMU2S Extruder Idler + Filament Sensor Sensitivity Increase

thingiverse

This is the exact Prusa i3 MK3S MMU2S extruder idler with one layer added to the part at the top that breaks the filament sensor beam. I modified this piece because I was attempting to pair PETG and a Flex filament. I found that the Flex filament was too squishy to push the idler out enough to engage the filament sensor. I tried loosening the idler spring, but once it was loose enough to engage the sensor reliably with Flex, it was too loose to grab the PETG. The only way to solve my problem was to make the filament sensor more sensitive. I did this by adding one layer to the piece at the top of the idler that breaks the sensor beam. It is now a hair trigger, and can detect both Flex and PETG at a normal spring tension.