Q:

Is there proof that 3D printer made nanoparticles are dangerous?

Facts:

Breaking down (or melting) plastic creates nanoparticles.1
3D printers melt plastic.2
Therefore, 3D printers make nanoparticles.3
Nanoparticles are evil.[citation needed]

Wait, What?

1. Plastic waste disintegrates into nanoparticles
2. How do 3D printers work?
3. Characterization of particle emissions from consumer fused deposition modeling 3D printers

I know that 3D printers make nanoparticles. But is that actually a safety concern? There are multiple products on the market today that will suck up your nanoparticles for you. However, I can't see an obvious danger in the particles themselves. Who decided that these nanoparticles are bad for your health? 3D printers put out plenty of heat too, but nobody thinks that's dangerous.
So my question: Does anyone know of sources/research articles of the possible harmful effects of nanoparticles created by 3D printing? I'm looking for real scientific research. Thanks.

A:

At the time of this writing (March 2019), I don't think theres any study on the health effects of nanoparticles emmitted by 3D Printers. The general consensus seems to be right now that those particles are potentially harmful, as they build up in the lungs, and therefore precautions should be taken.
The reason why nobody has yet determined if and how harmful they are, might be that those adverse health effects are probably long term, and hard to isolate. Plastic is everywhere today - it's not that easy to just study harmful health effects caused by 3D printers.
But we can say for sure that plastic in our bodies isn't ideal and can cause damage, so we should avoid it.

