additive manufacturing doesn’t do well for high volume just yet because its slow— but additive manufacturing is very good for short runs—that is manufacturing relatively few pieces of the same thing.
This sort of thing at some point just has to be made for oil the oil business.
You just put one of the 3D printers near a couple sites and make what you need on the spot. The time it would take to train a guy to do the job would be minimal.
You would need a metal 3-d printer, industrial strength, those can’t be too cheap. Probably fit in a big rig though.