Prusa MK3S MMU2S Extruder Idler + Filament Sensor Sensitivity Increase

prusaprinters

<p>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.</p> <p>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.</p> <p>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.</p> <h3>Print instructions</h3><p>Print in PETG with standard Prusa recommended settings:</p> <p>Layer Height: 0.2mm<br/> Infill: 20% Grid</p>