Here is a filament cleaning box, easy to print easy to use, print all in one part open and flat on bed, doesnt need supports.
It is a very useful cleaner as it opens to insert on filament already fed through machine.
Print flat on back with two open compartments facing upward
add some common cut kitchen sponge in each side, add a few drops of Canola oil to the sponges and you are good to go. Clamp to your filament just before extruder to keep your filament clean and avoid contaminants which may block your nozzle up!
If you make and use it, please let me know, and post your photos.
I have updated to print with less tolerance for the machines which were having problems initially
I have further updated the files, the spring catch is more flexible now.
you can print with not supports with filamentcleanpsd.stl,
or if you feel you need supports use filamentcleanpsdsupports.stl, I have built the supports into the model.