Update: I apparently never uploaded the stl file for the rear corners. Well, now I have. Enjoy!

Large ABS 3D prints tend to delaminate during printing if you don't keep them warm while printing. This "thing" is a group of 3D printable parts to make a thermally insulating box from 1" PIR foam to contain your printer. I designed printed pieces to hold the foam boards because I frequently take my printer to demonstrations and I wanted to be able take the box apart and put it back together.
If you don't need to move your printer, just use duct tape to hold the foam pieces together and don't bother printing parts to do it.