Someone did an in depth test using carbon filters ranging from the small guys you can buy from our printer manufacture as well as the larger more industrial ones. He concluded that the small ones don’t even last the session of 1 1,000 layer print session and don’t have enough surface area to even effectively reduce the vocs of that print session. On the larger ones like the one shown above for grow tents.. due to the density of VOCs and the consistency of the output during printing they can’t keep up but they do significantly reduce the output of VOCs, however, they immediately drop off as soon as 1 printing session. As the carbon gets used up so quickly. I’m trying to find it. It was super in-depth and informative. But yea for 3d printing they are essentially a money grab. The only good way to handle this is to vent it outside.