Just a basic box for keeping paper organized. Fits A5 and A6 sheets perfectly, or you can fold/cut A4 into halves or quarters and it works great for those too.

Printed mine with regular PLA at 0.2mm layers but honestly any plastic should work. Layer height probably doesn't matter much either, I just haven't tested other settings.

The side walls and bottom are separate pieces — you'll need to glue them together. Use whatever glue works for your plastic (super glue, plastic cement, hot glue... whatever sticks).

That's it. Nothing fancy, just functional. Print it, glue it, throw your paper in it.