If your kids are like mine, they are hard on their stuff. This model replaces the clasp which broke at the little nub that locks it into the main shell.
I made the model so that it can print flat, which means it won't quite match the contour of the lunch box, it sits a couple mm proud on either side. I felt that printing flat without having the need for supports across the entire bottom was a better solution.
You will need to paint supports onto the little nubs on either side, but that is it.
The author hasn't provided the model origin yet.