I wanted a filter for ABS fumes and didn't find anything to my liking, so I designed this. It prints without supports and is modular so you can add or remove "cells" according to the size of your printer enclosure in 2 inch increments. The fan supports are sized for a specific fan, but the blower end is designed so that different fan mounts can be used if a different fan is used.

I haven't used it extensively, but it does move air from the enclosure through the carbon filters, so functionally it meets requirements. Whether its use is validated will be based on experience as I print ABS parts (usually I print PLA, so experience will be slow in accumulating).

The blower is a 75MM 0.3A 12V blower.  The filter pads are aftermarket cut to fit.  I also used a thin gripper pad to seal the blower to the opening.  To print without supports, the parts must be oriented correctly on the build plate in the orientation shown in the picture with allof the printed parts.