This is not a joke. Apparently, they can give off enough CO2 to kill you if you don’t have adequate ventilation.
The source said that the couple was using a laser 3-D printer that was venting into their residence. Symptoms and signs consistent with carbon monoxide poisoning were found in their bodies.
You can read the story here.
My name is Mike or in some cases Mick. I love programming, science fiction, audiobooks, cats, bike riding, and writing. I do not filter on this website so you may see nudity, cursing, or other profanity as required.