A clip-on filter for removing dust from filament to protect the nozzle from clogging or/and to lubricate the filament for some printer types.
I removed the original hinge because it kept breaking for me and made it clip-on at both ends. Prints in just under 30 minutes.
This model works well for 1.75mm filament. For 3.00mm/2.85mm I recommend printing it at 130% scale.
Using 20% infill gives slightly more flexibility in the clips.