This was awesome for my old filament that was dusty! Printed 3 to assure the spool of filament got clean before it got pulled into the extruder. Cut a sponge up to fit in the holder. EZ PZ
I'm a fan of snap-on filament cleaners but sometimes getting it lined up and staying lined up with both holes as you close them can be a bit tricky. The wings on this one make it a snap (pun intended.)
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