This is a case for a RPi Zero (2) cam running off of a PiJuice battery hat.

The back plate is in TPU to allow for a bit of flex for button pushes. I have not tested it in PETG though it might work.

As the case is printed out of PETG and TPU on the base layers, you'll need to change your PETG bed tempurature to match your TPU profile while printing.

The windows should be printed in clear or translucent TPU.

The gasket needs to have a pause to allow for glass insertion.

The rpjcam_body_m3_mount also needs 2x pauses to allow for nut insertion. 

The tool is to aid locking the cap and prying out the chassis.

BOM:

32 mm watch glass.

Raspberry Pi Zero (2).

RPi camera module. 

PiJuice Zero HAT + battery.

2x 5.5mm x 2.5mm M3 nuts.