Having just printed a set of these filament filters...: http://www.thingiverse.com/make:248107
I figured to take the next step & also try to create a dust screen to mount above the spools on my printer - to minimize the dust falling onto the spools.
Static will still attract some dust, but the majority will deposit on these screens, surely. :-)
This simple & straight forward design might change in the future, but so far it looks promising.
After printing the first (I need 2 sets), I noted that using a brim might be an option... the outer corners of the model warped a little bit - but once you have the model in hand it doesn't really show.