Mingda D2 Filament Cleaner
thingiverse
This is an Extruder build-in Filter for Filament. Just remove the top cover of the extruder and put the element under. it should fit to the square hole. The filament can un-/loaded with mounted element use a piece of sponge as filter/cleaning element. There are 4 spikes in the filterhole. Those are to prevent the sponge get out of the hole when filament move backwards.
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