The box is perfect for bolts and nuts or small things you are constantly searching where are they :) The box's hinges are placed inside a box. Hinges inside give you more room for boxes.
There are two versions pins. A tight one and loose one. So you can test out which one works best for you. A pin should be printed horizontally.
A cover has a simple lock mechanism. And you should hear a solid CLICK when you open or close a box. When the box is assembled you should first try to open and close for about 20 times to loosen up a bit. But I guess it really depends on plastic. A model in the pictures is made of PLA and it needed about 20 "clicks" to have a smooth opening feeling.
Please share comments and makes! And help me improve the Box with your suggestions.