Enclosing a 3D printer not only improves prints, it reduces exposure to noxious plastic fumes that smell bad and may cause long term health problems.
We don't make 3D printers; we make 3D printers work better.

Prusa i3 MK2/3 Enclosure
The new Prusa enclosure holds in the heat while keeping the power supply cool. The optional carbon filter reduces a lot of the odors.