This is a little case for small things you can hang on a key cord (or other cord). :-)
These screw cord cases are printed in PET-G and ABS (0.2mm resolution). Red is PET-G, green and silver parts are ABS. The upper silver / gray part is printed with support material and later glued on the lid part.
There are 2 different models:
Case 1 and case 2. I hope this is enough for you to find your way through the STL files :-)