Did you realize how much dust takes your filament?? And all that dust goes straight inside your nozzle??

This is a simple case to hold a sponge band.

Just get a scrub sponge, like 3M Scotch-Brite, cut off a 55mm x 20mm piece, remove the abrasive layer, fold it and insert into the case.

Then just make it grab your filament and say goodbye to clogged nozzles by dust!!!