Dry Box Filament Passage with Filter

I was looking for a filament passage that prevents the filament from falling into the box and keep the filament in the inside dry and clean.

After printing the passage I cut an ordinary sponge into little pieces. Next I screwed the passage from the inside to the box, took 3 pieces of the sponge and stuffed them into that passage right around the threaded filament. Finally i screwed the cap on it.
The more sponge you add, the more power the extruder needs to pull it out of the box.
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