In our small animal cage (for guinea pigs and rabbits), two of the fastening corners for the grid were defective. Therefore, I reconstructed them in Shapr3D and made them a little more stable, enabling me to simply reprint them with my 3D-Printer. Here is the STL file in case someone encounters the same problem.

It should fit most small animal cages from a variety of manufacturers/dealers that have a hinged grid on a plastic tray with a bottom grid thickness of 3 to 3.6 mm.