This is the base for my DIY enclosure, made with 3d printed Fittings and 490mmx25mm (outside diameter) PVC pipes. I've made 8 fittings in PETG (one for each corner) and then wrap a transparent PVC sheet (we use it as table cover) around, cut and glued with universal glue. I added velcro at the ends of the bottom, so they wrap around the pipes, and join the the other part in the inside for ease of removal/installation. and i also used velcro to help close the "door" (I've made it just with the same material, without gluing the front with the sides) it works well, I've printed a lot of things in abs and PETG in it with no problems at all, and even without additional heating, just if the bed heat it can be used at a Creallity ender 3 v3 KE (the one i have) without the spool holder at the top, but i guess most of the ender series should fit too, and if any thing just cut the PVC pipes in bigger sizes. I'm also planning adding a aluminum sheet on the top of the box (under the plastic) to serve as a table for some tools for the printer, but nothing too heavy