filament cleaner and oiler

[update] optimised hinge

Print in place filament cleaner (can be used as an oiler if you use a Bowden setup)

Simply add pieces of foam or sponge on each side and you're done!

To use it, clip it around the filament

Printing settings 

Standard PLA with supports inside the box.
0.15mm layer height, 0.4 nozzle, 100%infill