This works for the RPI 3B+. I haven't tested any other models.
Additional Parts:
2 M3 screws (not too long otherwise they may collide with the extuder)
Assembly:
- Attach the bottom of the case with the screws as shown in the picture

- Place the Raspberry in the case
- Close it with the top
My Print settings:
- Printed in PETG with 0.15 mm layer height.
- Supports only for the big opening in the bottom part.
- First layer of top part printed with half speed.
- Infill : 50%
Tags
The author hasn't provided the model origin yet.