The box is not printed as a single piece, but 6 modular plates joined with dovetail joints. Individual plates are relatively flimsy, but once assembled the box is rock solid.

This way, it is much faster to print, and is stronger since the layer lines are protected. It also let me experiment with infill for some cool effects.

Closer look at the top pattern

Front pattern

You can't see from the images, but each plate is printed without top layers, which make it even faster to print and use even less filament, compared to a vertical wall of the same weight.

The back

Gyroid air vent