Nothing special.
The model shown here is printed with Prusament PETG Chalky Blue on a textured PEI with 15% infill.
I printed it with 0.1 layer height due to the round shapes.
Align the lid to the case as shown:
slide the hinge-ball of the lid into the hinge-dent of the case:
push the lid gently down, until the hinge-ball of the other side snaps in the dent:
Lid and case has aligned holes for round magnets with d2 x 1mm:
The magnets will be pressed into the holes.
Use pliers or a vice to press them in until the top surfaces of the magnets are aligned with the top surface of the lid resp. the case.
Take care of the correct orientation of the magnets.
Version: 1.0 - 13. Jan. 2023 / Slicer: PrusaSlicer Version 2.5.0
The author marked this model as their own original creation.