I’ve seen cheap ikea end tables modded for enclosures. Particle board is used to seal up three sides (between each of the legs), and an acrylic panel attached with some cheap hinges goes in the last one to make a door. A hole is cut in one of the boards to allow for ventilation.
I sold my 3d printer for this reason because there’s no where I can keep it other than my tiny room. I want at least a large storage space that can be ventilated to turn into a sort of creation studio resplendent with a printer, sowing machine, soldering station, etc.