HSE today issued a bulletin which includes advice regarding carcinogens associated with welding and similar risks associated with filament 3D printing.
Whilst most modellers will spend rather less time exposed to 3D printing than someone employed to do printing, it strikes me that many pursue their hobby in small, poorly ventilated 'dens'.
This being so you might like to follow this link so that you can make your own judgement of risks and any need for improved ventilation.
https://www.hse.gov.uk/index.htm?utm_source=govdelivery&utm_medium=email