Prusa I3 MK3S filament guide
thingiverse
Nice filament guide with quick clip function on the Prusa I3 MK3S frame. Because of the design, there is no risk of the extruder colliding against it during high Z travel. In addition to the small opening, which also allows a side filament insertion when it is already connected, this guide also has an additional hole where a filament string can be "parked". In my case it fits perfect to my spool holders because it largely avoids uncontrolled unwinding on the spool when the extruder pushes the filament back. I prefer PETG 0,2 layer/20% infill, but PLA should also work without problems. No brim or support is needed. Have fun printing!
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