FlashForge Creator Pro Filament Filter

To be functional, some filtering material (sponge, foam, etc.) needs to be glued to the knobbed side. Then slide it onto the very bottom edge of any 6mm feeding tube for 1.75mm filament (potentially 3mm as well) with the filtering material facing incoming filament.

As the filament is drawn out by the extruder, it will pass through the filtering material and any dust will wipe off (if the filtering material is dense enough).

I suggest sharpening a piece of filament and stabbing it through t