A cover on the printer helps trap the heat in the printer, which can help printing some materials that like to warp a lot. Also, if a fan and filter is added, it can reduce particle emissions in the printer room. There are some hoods available on the market, but they seem way overpriced to me for what they are. I tried to create a somewhat aesthetic, lightweight design that does not draw to much attention to itself. You will need a cnc router to cut the wooden parts. A large 3D printer may also work.