Great post over on Hackaday about 3D printer safety.
I’ve been warning folks about this problem with 3D printers forever. Anything that burns things creates some kind of a gas that you should avoid inhaling. Especially when you start talking plastics.
Perhaps it’s not surprising that aerosolized plastic is harmful to breathe, but the sheer magnitude of particles detected in this study is worth taking note of. If you don’t already, it might be good to run your 3D printer in the garage or at least in a room that isn’t used as living space.