Making a dust filter - Best material

[OlekKing]

My Corsair Carbide has a large 240mm side fan which has no filters whatsoever, i remember i used to have it on since it really helps with airflow, and i endep up with dust everywhere.

 

Once i removed i had almost no dust at all inside the case, but i'd prefer to have it on since i'm getting two DirectCU II 780s in SLI.

 

I'm not going to spend money on pre built filters.

 

I wanted to know what would be the best material for filtering that's fairly common and cheap.

[LogicalDrm]

Plastic mosquito net could be good choise. Or loose foam.

[Zeals]

Stockings are a good choice in my experience, probably one of the more ghetto solutions but they work. Unless they are fishnets, those make TERRIBLE fan filters.