During my last trip to Portugal, I was asked to carry documents with me for emergencies. The problem was that the papers in my luggage might get wrinkled or dirty. I decided to design a small, simple folder, the size of a note

As you can see in the 3MF file, there should be support under the hinge

The assembly is very simple. Just push a piece of consumable into the hinge hole, and then slide the buckle onto one of the tracks.