Negative pressure Activated Charcoal filter parts

thingiverse

I wanted an activated charcoal filter for the flip top LACK enclosure of my Qidi 6.08 mono resin printer. There was sufficient room in the enclosure for a fairly large filter element. I built a filter core sized around the intake of a radial blower. The core was wrapped with a thick activated charcoal pad. Flanges on either side of the foam board enclosure wall hold the blower intake manifold and the filter. The filter is based on negative pressure from the blower intake, pulling air from the enclosure. As the enclosure is not air tight, air infiltration helps ensure all air leaving the enclosure is via the filter & blower. The intake manifold fits a Wathai 120mm x 32mm High Airflow Blower Centrifugal Fan ( https://www.amazon.com/dp/B08Q3Q2354 ). The listed version comes with a 12v supply & voltage/speed controller. You can run at lower speeds for less noise (& less cfm movement). Two intake manifolds are listed, one with a guard & one without. No guard is needed (or recommended) for use with the filter core. The core uses a 7.5x50" strip cut from a 16x50" activated Carbon Filter Charcoal Air Filter Sheet ( https://www.amazon.com/dp/B08TWTQXBS). The rolled sheet is held by the clamps (see pictures). You can use a screw to secure the clamps or a small zip tie. I used the zip tie because it was quick & simple. Print two copies of the flange, you will need to orient them so that screw holes line up when installed. The flanges are sized to hold the blower intake manifold & filter core tubes. Secure them on installation by drilling a hole & adding a screw on each (see pictures). I used M3 cap screws and matching nuts, obviously other, similarly scaled, fasteners could be used. Placement in the enclosure is a matter of personal preference. I used bottom rear partially because my enclosure has a flip top as well as a door, and the side mount was the easiest for me to access with how I have things arranged in the printer area. Mounted to the back wall would have allowed more front/back space for printer placement, but less left/right. The same parts could also be assembled to make a standalone filter within an enclosure space. This object was made in Tinkercad. Edit it online https://www.tinkercad.com/things/fIoucP2yZ6g added a 120mm fan mount - NOT TESTED EDIT 4/28/2022: I recently added activated charcoal pellets in a mesh bag to the interior volume of the filter. A 1 lb. bag fits pretty well.