I drive an old Montero. I frequently must wait a week or more for parts to be shipped - if I can even find them online. I dream of a day when I can walk into a shop and pay a premium for parts-on-demand.
You're dreaming of today? Because that's what it is. You can walk into just about any machine shop and get your part as long as you have drawings and material spec. You probably won't be happy with the cost, though.
The point is that the spare parts you need can be made with traditional manufacturing processes because that's how the original was done. Just because you only need one, doesn't necessarily make it easier to produce by a 3D printing machine.
