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 w