Did you make a hole that was too big to fit your part? Or are you replacing an existing mounted part with a smaller one? Welcome to the customisable mounting hole adapter.

Print the mounting hole adapter to fit your small part into the bigger hole, and print the optional washer if you want to screw the adapter in using the new part's threads.

Model is customisable, OpenSCAD source provided. Let me know if any of the descriptions are unclear.

Example is for a 16mm mounted part to fit into a 20mm mounting hole, with a 6mm thick plate to screw onto.

Latest OpenSCAD sources available on Github.