A long time ago, Prusa uploaded a nice guide on how to get a cheap enclosure for your printer.
There, they showed 2 options, either a Ikea Lack enclosure or a Pop-Up Tent.
The Lack enclosure has the drawback, that it takes up a lot of space, and their idea of the Pop-Up Tent would need you to put the printer inside.
But there is an easy third option. I modified the printer the same way as you would with the Lack Enclosure, but instead of the top half being another Lack table, I instead use the Pop-Up Tent - just use the opening to put it over the printer, and it easily reduces drafts. But the biggest benefit is, that it takes up nearly no place to store when it's not in use.
I've used the following parts to allow this to work:
So far, I've tried the following materials with it:
PC does still warp, but now it's a lot better. Samples for tensile testing (15cm x 2cm x 0.5cm sticks) still warp like crazy, but normal geometries print great.