Below is the original description from Thingiverse. With Multiboard peg added to the back I printed in PLA with supports (tree) using 15% infill 

Supports needed for Multiboard peg 

Summary (taken from original model) 

This is a case for the Raspberry Pi 4 Model B that is designed to work without screws. It should also work with the Raspberry Pi 2Bs and 3Bs. The board clamp has a cutout to take a 30mm x 30mm x 7mm fan.