Being someone who often lays down and walks around in wet areas while shooting with my Instax Square camera, I wanted a better way to protect and carry the photographs while and after they're developing - so I came up with this.

This case has a hinged lid with a lip to keep it secure and act as a light baffle, and uses a magnetic clasp to hold it closed. It's small enough to fit in a pocket, and isn't uncomfortable to keep in said pocket for a long period of time. It's robust enough to take some knocks and should stop your photographs from getting crushed, bent or splashed (though it is not immersion proof). It'll hold about twenty instax square photographs snugly, and is designed so that they're easy to remove from the case. 

I recommend printing in a dark filament to make it as opaque as possible to ensure minimal light transmission (if you care about that). The example in my photographs was printed in Prusament PLA Galaxy Black, though I have also had good results with Galaxy Purple.

In order to make this, you will need the following:

1x M3 14mm hex bolt

2x M3 washers

1x M3 nut

2x 3mm thick 6mm diameter neodymium magnets

Recommended print settings:

0.2mm quality, 25% infill, 3 perimiters, snug supports, 3mm pattern spacing, supports on build plate only. 

The .3mf and gcode files include the necessary pauses for inserting the magnets into their receptacles.

You can tighten or loosen the hinge bolt to your preferred tension.