Venting the enclosure environment to the outside is certainly the best alternative unless you consider the outside environment. I tested the enclosure printing ABS and found the filter removed all odor produced by extruding ABS. I also used a "Smoke Bomb" we use to detect aircraft pressurization leaks. The aerosol can doesn't actually produce smoke but a fine particulate that is highly visible for inspection. This makes it ideal to test the effectiveness of the filter. I found that a 65 CFM fan that has high back pressure capability is more than enough to completely filter both the ABS odor and the smoke particulates.
In my case I also have an area exhaust fan that removes about 5% of the room air per minute with fresh air as a makeup.