This is a chain cleaner for your bike or motorcycle. Print one handle out of ABS/PLA/PETG, this one happens to be PLA and works fine. I used 15% infill and it doesn't flex but you may want to beef it up. Print three brush pads out of your favorite flexible filament, this is ninjaflex semiflex which works good. Slide the pads into the holder and get to cleaning! Wear out a pad? print a new one! Also useful on unusual household items, rods and such.