I was about 30 years early in wanting to automate manufacture of spare parts.
Looks like a resin printer was used, Which is something I would like. Especially a metal sintering like I saw demonstrated at SpaceX.
A lot of the work on watches (as well as other things like woodworking.) Is the creation of tools and jigs. For example I had to take my new Heuer to the local Hardware store to get the case back off. Had I a good resin printer I could have printed the cashback die myself.
Movement holders are another thing. I noticed someone revived
@Archer 's excellent hand tutorial. Although with a snide locker room comment. Would be nice to print a movement holder with the jewel blocks. One of the Venus 170 watches I want to restore has a missing chronograph hand jewel. Probably were someone knocked it out as these hands are often according to the old textbook hammered (which is a form of riveting) on.
All these little tools and fixtures are part of the high price of entry into watchmaking. A lot of the reason I am hesitant to service my nicer watches myself. (Well one watch in particular.)
Purchasing tools does not satisfy the impulse the same way snagging the project watch (Which is never the last one available for that low of a price.) does.