I had a toolcase wich had a problem with the hinge. Because the plastic gave up, and broke, I had to figure out a repair kit. So I designed a protection around the hinge wich I glued to the existing case with bison superglue.

The interior diameter is 11mm and the total width is 2mm. It is printed with 3 walls wich makes it basicly 100% infill, in PLA. Using a CAD software you can adjust these parameters if you like.