This is a case for Raspberry Pi 3 Model A+ and Raspberry Pi 1 Model A+.
The dimensions of the case are 72 mm x 60 mm x 20 mm. It consists of two parts (a base and a lid) and has been designed to be fully covered with only cutouts for ports. It's easy to print and assemble. It doesn't require any additional screws or joints.
The lid should fit quite tight, but it should also disassemble from the base without using too much force.
The author marked this model as their own original creation.