Rounded corner door hinge spacer.

thingiverse

To fix a sagging heavy solid core interior door caused by frame compression under the lower hinge, follow these steps. First, remove casing trim and add shims to raise the affected door corner. Alternatively, use a printed spacer between the hinge and frame, which can be customized using the provided Blender project file. Scale or adjust the 2mm thick STL file as needed on your printer software, ensuring solid infill for optimal results.