Prusa i3 MK3S Filament Dust Filter
thingiverse
To Replace the Filament Sensor Cover, Follow These Simple Steps: Insert a piece of foam between the cover and the cap. Use a sharp-angled cut of filament to poke a hole into the foam. You can attach a PTFE tube to the cap of this dust filter and extend it all the way to your dry box for added convenience.
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