I designed this box which is 14,4 cm long, about 6 cm wide and almost 5 cm high (outside). It works with a hinge and the whole box can be printed as one piece (opened and upright). As material I used PLA. If you close the box, the lid should be held in place. In the version I printed, it didn't work well but I improved it. The file above is already the improved version. I didn't test the new version, so please let me know if the lid is held in place now.
tool_box_v6.stl | 586.5KB |