Quote Originally Posted by KallenX View Post
PLA is made from vegetable sugars is it not. Probably as toxic as breathing in wood dust. Polycarbonate I hear is quite toxic though, among other kinds of filament
Just because you can eat something does not mean you can breath it. For example, rice hull fiber is GRAS (generally recognized as safe) according to the FDA. However, I suggest you not breath it. Water, critical for life as we know it. I, again, suggest you not attempt to breath it.

Toxicity and breathability are completely dissimilar aspects of something and not necessarily mutually inclusive of each other.

Also, just because something is made from something else that isn't toxic does not infer that the resulting product is also not toxic.