Should be better than nothing in any case. A guideline mentioning that there should be extraction and proper ventilation near 3D printers - just like in laser printers, soldering stations, etc - would probably be wise.
Yes, let's not forget what laser printers used to spew out. Not sure if that got any better with time?
not the 0.1 size particles they talk about - all but the highest end filters cant remove that small. The best bet is to treat it like a gas and exhaust it.
A 0.3 micron filter will still remove some of the 0.1 micron material. Filtration works in lots of ways. Also, it is likely that the 0.1 micron particles here have a charge. The 0.3 micron test particle used for HEPA evaluation specifically does not have a charge. Using charged filter media is a common method to capture particles that are too small for the holes / pores in the filter element.