A micrometer case for a Mitutoyo micrometer - it may fit other brands, but you will need to check fit / sizing.
Use a brim to prevent warping
2x2mm rare earth magnets are glued into the holes on lid and base
Hinges should have appropriate sized drill run through them to clean them up
Hinges held together with lengths of 1.75mm filament.
The author hasn't provided the model origin yet.