Filament Guide with built in Dust Filter for Prusa

I liked the design and fitting with jkoljo`s filament guide, but since I needed the dust filter, it was too much of a hassle when switching up filaments. So I decided to merge both into one.

The guide snaps tightly (I mean real tight). Now I can easily swap out filaments without needing to switch the dust filter too. Works perfectly together with http://www.thingiverse.com/thing:27546 spool holder.

Don't print with solid infill. You probably won't be able to snap it in place. I used 20%