Filament Dust Filter

Only 25 minutes to print on my Ender 3.I used the piece of foam on the unclogger thing that came with the printer! I cut off two pieces that fit in the dust filter, thick enough that there's no room between them, but not so thick that it's hard to pull filament through it. It sits above the extruder, just high enough that it won't interfere with the extruder gear.