> would have a 3D printer to make one off repairs

The problem with that is, like many people found out the hard way, that printing is the easy part and 3D CAD design is much harder.

Many people now have 3D printers to print all kinds of useful tools, though, and there are businesses dedicated to one-off prints for the very occasional repair.

3D cad is avoided by having a critical mass of other people putting their cad online. I used https://makerworld.com/models/77668 to replace my one that broke. Easy-peasy.