This is a simple filament feeder (1.75 mm) for a dry box with a built-in dust filter.
Holes are designed for m3 bolts. I'm using 16mm bolts, but it doesn't matter as long as you can attach the nut on the inside.
I'm using thin packaging foam folded a couple of times as the filter.
Infill could be lower, but not tested.
Outside part sketch
Inside part sketch