It´s a really simple box to open, you just have to figure what is the right button and push it. You can put some fake pushable buttons but is not mandatory.
I uploaded in two sizes, 15x15x15cm and 10x10x10cms.
It´s easy to assemble, just glue the walls with super glue (look at the pictures). The small holes in the base is for use a piece of filament (4-5mm length) to fix the parts.
Put the button from inside and glue lock1.stl, for a fake button glue the lock3.stl and then glue the stopper.stl (in the pictures I only glued the stopper to the real button). Lock2.stl must be glue to the lid.
If you don´t wnat to put fake buttons just glue them to the walls.
I use 0mm horizontal expansion on cura and works great for me, but it´s advisable make some tests first with one button.
There is almost no supports needed.
I hope you like it :)
Check out my other puzzle boxes