"STOP VOC" 120mm Fan Charcoal Air Filter

thingiverse

I printed a lot of matte PLA recently and it was stinky. Walmart has tubs of activated charcoal for $8, and I had an AC Infinity AX1225 fan laying around. Top-loading canister with printed grille for front and back. Little tab latch on the body should hold it in place, convenient finger ring to remove it with. Bolt any 120mm fan you have (the higher the static pressure the better!). There's a notch in the body to hide a power cable if you'd like. No supports needed at all. Glue the wedge in on the body after printing. If your printer prints true, you should get a canister that easily slots in to the body. To save time and money, only do two wall loops on the body. I set 3 or 4 on the canister just for strength since it's thin. ~~**I HAVE NOT TESTED THIS YET** as my canister is still a few hours from finishing. Will update once I have a chance to.~~ I had to spend a lot of time sanding down my first canister. It fits now, but was deformed in two ways. 1) the left and right walls had bowed out slightly while printing and 2) there was some ribbing caused, I suppose, from all the movement of making the towers for the mesh holes. I made the hole in the body slightly larger and added ribbing to the cartidge to help compensate for this. Having also dumped charcoal in mine I realized the fan does not have the strength to push air through so much material, so I made a new version that has some additional baffles to help create more surface area for the charcoal to work with. Larger pellets that leave more porous space are highly advised! One $8 can of [fish charcoal](https://www.walmart.com/ip/Aqua-Tech-Activated-Carbon-Aquarium-Filter-Water-Cleaner-9-oz/10313138) fills it half-way. I've had this running in my office for the last five hours and already I notice the air smells... cooler. It's just huddled behind my printer, quietly circulating air. Totally worth the print time and minor cost of the coal!