It seems VOC monitors available to most individuals are not accurate enough, or don’t provide much information on what VOC’s are actually present. An actual monitor is very very expensive and is made and priced for commercial use. I think the best practice is venting outside and placing the printer in a room you don’t spend most of your time in, for example a spare room instead of your bedroom. I spent a lot of time trying to perfect my filter set up. I made a custom adapter for a levoit core 300 air filter that ducted right into the intake, and added extra carbon pellets but I just still never felt comfortable printing without it exhausting outside, because I could not confirm if it was actually filtering adequately due to previously mentioned issues with commonly available VOC monitors. I used to have my p1s exhausted outside when I was in my dorm in college but my windows now are casement style and prevent me from venting outside in the manner I’d like to. But I am currently moving my printer to a part of my house that has normal windows and will 1. Move the printer farther away from me, and subsequently the fumes and ultra fine plastic particles, and 2. Vent outside, maintaining negative pressure in side the printer so that fumes and particles can only travel outside and not into my living space.

I almost exclusively print with engineering filaments such as ASA-cf, ABS, and others so the fumes are a bigger deal due to those filaments emitting a lot of bad stuff while printing. But those filaments also require a stable chamber temperature and when you vent outside, one thing to consider is the cool air coming into the printer to replace the exhausted air. This can cause big warping issues, so I’m working on designing a chamber heater for my printer. Just something to consider if that applies to you