Designed this box to practice the 3D modeling of moving parts.
It measures 10cm x 7cm x 5cm of height (two halves of 2.5cm each) and the walls have a thickness of 2mm.
I made it so it needs almost no supports. You will have no waste of material, but I consider them to be necessary inside the hinge part, if you set it to generate supports over 80° you wont have unnecessary supports in other places.

Creality

Ender 3

No

Yes

200

10