A few days ago, I bought a cheap angle ruler on Amazon and wanted a hard case. The internal dimensions of the box are 35.5 mm wide x 200 mm long x 20.8 mm high. There is a storage box on the lid, where I can put the ruler, as well as store documents and spare batteries. I also added a lid STL without compartments. At the end, I extruded a graphic representing the angle to help identify it on my shelf.