This study tested different control methods, including an enclosure. The enclosure with a high-efficiency particulate air (HEPA) filter had the highest removal effectiveness (99.95%) of nanoparticles.

https://pubs.acs.org/doi/abs/10.1021/acs.est.7b01454

Emissions will go down, no? Also depends on the filter somewhat, I guess. But from how I understand it, the emissions aren't that high to begin with. Of course breathing in metal nano-particles from filaments with additives doesn't sound that healthy...