80mm Activated-C Air Filter

An air filter using a chamber to hold activated carbon granules in front of a standard 80mm PC case fan, for cutting out ABS fumes.
With an optional cap to direct the exhaust over your the top thick-sheet electronics on a RepRap Mendel, and an alternate inlet barrier with little feet to slot over the top bars on a Mendel.

UPDATE 1.1: Reduced fillet at the outside corners slightly, as the previous outline was so close to the hole that skeinforge wouldn't generate any lines between the outer wall and the wall of the bolt holes, so the holes were only supported on one side, weakening the part when being reamed.