Nice build for a filament filter for your 3D printer. You use sponges for the “filter” part. Why do you do this, apparently the dirt that may get on the filament will build up on the hotend and cause it to clog. Haven’t seen this myself yet, but I don’t print alot (yet) either. My 2 cents, I think there is a cheaper way to do this….
http://www.instructables.com/id/3D-printable-filament-filter/