Ultra-fine particles emitted by commercial desktop 3D printers [pdf]
Non-paywall version: [1]Probably the way to deal with this is to have an exhaust system which keeps the build chamber below atmospheric pressure. Exhaust through a water air filter.[2]  Water air filters work well on particles, but you have to keep dumping the dirty water and adding fresh water. They're not used much in HVAC or vacuum cleaners because they take a lot of blower power, but for a small 3D printer, where you're not moving much air, they should work.[1] http://ec.europa.eu/environment/integration/research/newsale...
[2] https://www.youtube.com/watch?v=ZyEyO4iuz5E