This is exactly what you were looking for so i am glad you found it finally! lol
Universal 3D-print Filament Filter
Universal 3D-print Filament Filter A sponge wipes the filament clean from any dust particles and prevents them clogging the extruder. By dropping a few drops of common mineral oil on the sponge the filament passing through gets lubricated thus relieving the extruder motor from strain.
The author marked this model as their own original creation.