This box is printed in two parts : the container and the cover. The container has a groove that can act a a living hinge, in order to bend its extremity.
An end stop prevent the cover to slide too far.
Dimensions : 52x32x4.5mm
Technical
I used PLA and 0.1mm layers.
PLA seem to allow the living hinge without breaks (so far; it is not a box I am going to use everyday). If you print this box and have so information about the hinge durability, please write a comment here!