After my Cupcake (#2425, Rosie) started giving off more ABS fumes than I was comfortable with in my small college dorm room, I decided to start working on a filter system.

It uses a respirator filter and a computer fan to filter out air. The other large openings have to be covered, but the system in general isn't airtight, as the top of my cupcake is open allowing the plastruder to move up through it. However, as long as the sides are somewhat airtight this significantly cuts down on the amount of fumes that come out of your cupcake.

This system isn't perfect, but it works, and for my purposes is awesome.

Vanilla parts: fan with 3" diameter blade. I used one lying around, but you may have to adjust the screw holes if these aren't standardized. Filter. I used a respirator filter bought at home depot. However, you might look in to an activated carbon filter if you can find one and cut it down to size. A respirator filter works just fine in my testing. M3x10 bolts & M3 Nuts. .093" thick acrylic or other board to laser cut.

1. After shapes are cut out of .093" board, bolt the fan to the largest part.
2. Assemble acrylic cube around fan, using acrylic cement and ensuring that the wiring for the fan can pass through the provided hole in one of the parts. Leave off the part with a big rectangular hole.
3. if you're going to use a respirator filter, attach that to the rectangular hole. hot glue and acrylic cement work nicely as far as I can tell.
4. If you are never going to change your filtration system, feel free to glue the respirator's acrylic sheet to the rest of the assembly. However, I used duct tape because I may add a carbon filter yet.
5. hot glue all joints to ensure air tightness.
6. mount to the side opposite the circuitry. You will probably want to drill holes so that you can bolt the acrylic assembly to your cupcake
7. use cardboard or acrylic or any other material to cover the front and back openings. The front should probably have some hinge mechanism so that it can open and close allowing you access to your printed objects

If you have any questions just let me know and I'll see if I can help.