The original version is for a Raspberry Pi Zero 2 W with the GPIO header soldered to the “clean” side of the board.  The problem I had was that if you want to connect something with the GPIO header and you want to mount it, the wires are in the way. Plus the GPIO header on my Raspberry was soldered to the components side and I didn't want to resolder it.

I recommend PETG with at least 2 top and bottom layers (for the solid version), 3 outlines and no parts cooling fan for good layer adhesion. 

For the Mesh version (better cooling + power light visible): No top or bottom layers, and a maximum of 40% infill or else the mesh will be too dense.

If you are using a Camera and you're asking a lot of your Raspberry Pi Zero 2W, it can overheat and throttle down. Consider my modded case lid with fan.