These are parts for a partial enclosure for a Creality CV-01 Laser Engraver.
The base is a 1/4 inch thick, so that it lines up with a 1/4 inch sacrificial board.
All screw holes were designed for #8 3/4 wood screws.
If you want the walls, this fits nicely mounted on a 2' x 2' piece of plywood/mdf. My purpose for the walls is so that my kids don't wander into the room and look up into the laser.
Given the wall height I made, the top wall corners are not necessary for the wall stability, but I designed them, so I printed and used them.
The author hasn't provided the model origin yet.