Simple geiger counter case for the kit linked below. Simple magnets can be inserted/glued to snap the case lid closed. Simple install, simple print. Shouldn't require supports. Let me know if you have any issues.
Kit
https://www.amazon.com/dp/B08FRL8J6S
Magnets, 8x1mm
https://www.amazon.com/gp/product/B07G878JHK
Magnets 6x3 mm
https://www.amazon.com/gp/product/B07KZQGWNN
The author hasn't provided the model origin yet.