Hi guys
I found an existing thread but it was hard to draw conclusions from it so I’ll try a new one. My objective is to make a simplified chart of materials for indoor printing with marginal ventilation (essentially meaning stock printer and a normal living area). And to me there is not only the question of “toxic” but also “smelly”. If it’s 100% safe but smells like a burning corpse, I’m not printing it indoors. I picture we should be able to make it this easy:
Material | Smell | VOC/FP/UFP/SER | Long name | Comments |
---|---|---|---|---|
PLA | little | often stated as harmless | polylactic acid | |
PET/PETG | little | often stated as harmless | polyethylene terephthalate [glycol-modified] | |
TPU | little | often stated as harmless | polyurethan | |
PC | mild? | ? | polycarbonate | |
PP | mild? | fair? | polypropylene | “no fumes” |
PA/PAHT/PA6 (nylon) | ? | ? | polyamide | |
PS/HIPS | ? | toxic | polystyrene | |
ASA | distinct “plastic” smell | toxic | acrylonitrile styrene acrylate | |
ABS | stinks | toxic | acrylonitrile butadiene styrene | |
anything-CF/GF | - | fine particles (FP) | carbon/glass fiber | HEPA can reduce FP |
A HEPA filter must catch at least 99.97% of FP (fine particles, 0.3µm or larger) but it dosn’t reduce UFP (ultra fine) much.
I assumed I can group PET and PETG as one for this purpose, and same for the nylon variants. Please enlighten me if that is not the case.
This topic can create long discussions so please make it simple! Let’s establish that even PLA produces some VOCs and particles that are not exactly helping the indoor climate. So please let’s keep it on a level like “not worse than PLA”, “mostly fine” or "this is toxic for real, avoid”.
The “smell” parameter can be subjective (I don’t mind the smell of ASA but my wife do) and it might also vary among brands. Perhaps start out with Bambu’s filaments, and we can add comments if we know some particular other brand is significantly better or worse. Personally I’ve printed PLA, PETG, TPU, PC and ASA so far, all Bambu except some TPU. ASA smelled for sure (I didn’t find it particularly bad, just “plastic”) but I can’t recall if the PC smelled at all? The others do not smell at all IMHO.
As for improving ventilation of room or filtration of printer, please leave it out from this thread! It’s a good topic and I’m looking into that as well but this thread is not about that. However, if some material mostly produce VOC but not particles or vice versa, it could be a data point.
I found contradicting data for PA and PC. I’ll be continuing exercising my google-fu. Will update the table over time (with your additions too of course). Also, this a wiki entry. I’m not sure others can edit it right away or maybe some moderator need to do some magic?