A clamshell box is meant to hold a master square or other similar-sized items. 

Printer Settings:

Egaloo PLA+

Temp: 220

Infill: 100%

Speed: 80mm/sec

Instructions:

1) Print two copies of the box. Sand as needed to ensure a fit.

2) Glue a 8mm x 3mm magnet into each corner spot (nonhindge side)

3) After the glue sets, clamp the box together so all four corners are secure.

4) Glue an 8” piano hinge to the side opposite of the magnets. 

5) Pad with foam as needed. 

Parts:

Magnets 

Hinge

Foam