Prinrbot filament cleaner

This filament cleaner can use any sponge you like. I use sponge from a dish scrub brush. Take the ball of the scrub brush apart and
cut as many as six filament sponges from each pedal (see picture).
The rectangular sponge is then folded over and inserted into the
cleaner. The bottom offset foot allows the holder to sit flat on the
filament extruder.