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Since everyone here seemed to like my Pegboard designs, I figured I'd share this as well. When making the Only Sensor (see the home automation community or my site), I used this Solder Fume Extractor to keep my lungs nice and clean.
Fully 3D printable, and a full bill or materials on the link. Enjoy!
Hrm, not sure why the image returned a logo, but here it is:
Nice I've been meaning to build one of these but solder so infrequently that it's not at the top of my ADHD list.
One critique here is that your power jack is not rated for the amperage you're putting through it. Those black and green connectors are only good for 2-3A (even the listing says 2A). I have found that these work really well and claim to be rated for 10A.
Also if your fans are only 2.7A each and the controller is 5A, there's no real need to get an 8A power supply, but this is nitpickey and doesn't really matter either way other than a small additional cost.
All good input, I'll make some updates, thanks!
The charcoal filter in front of the HEPA one does nearly nothing afaik https://electronics.stackexchange.com/a/546074
Not sure how much this 
stopped, but it was definitely not nothing
Most of what you see on charcoal filters are literally just dust and water.
Plus, nobody actually keeps up with filter maintenance. Charcoal filters sitting in free air are horrible for this. Charcoal filters have a saturation time as a function of mass
I was looking into fiber laser safety for ABS vaporization for my company and came across a few studies (can't find right now).
Activated charcoal filters in free air become saturated after like a week or so of use just because of the fact that they absorb both the tiny amount of unwanted compounds along with massive amounts of common air particles. You really need an enclosed container with butterfly valves like the Weller units https://www.weller-tools.com/us/en/filtration/products/solder-fumes with heavy carbon filters along with other absorbers in order to not completely saturate.
After the first week, the "solder fume extractor" filters are literally just collecting dust. Your charcoal filter looks exactly like my mesh computer dust filter in the picture as far as what it caught.
I’m using it with no high expectations as in „it’s probably better than nothing, and the fan pulls some of the fumes away from me”. As for ABS (which I’m printing VERY infrequently) I’ve printed Bento Box for my printer (from ABS of course) and haven’t actually mounted it on my printer yet (because I print with ABS/ASA so infrequently);) Besides that my printer sits in a boiler room which (like the rest of the house) is actively ventilated using a recuperation system.
This one looks way denser to me than OPs and the one from stack overflow. (but I may be wrong)
Thanks for sharing the photo, it definitely looks useful!
Well, that makes me feel better! I have the parts to make a charcoal-only filter but was too lazy to assemble it before doing a big soldering project recently, choosing to just open the window next to me instead. It's nice to know that it would've been useless anyway, so my laziness didn't actually cost me anything.
Charcoal is a smell filter, it's why it's used in front of a HEPA.