I do quite a bit of 3D printing work. Restoration application in buildings still isn’t all that practical by deposition. You’d do this all with CNC machines. You can do that stuff with stone too. Anything built in the late 1800’s and 1900’s can be rebuilt today if there’s a digital fabrication shop that can scale up a large project or a market for it.

There’s still stuff being done by hand. Check out the Cook County Hospital in Chicago. Decision was to either restore it with machines or artists. They opted to use artists which I think was the right decision. Still, machines can make restorations of exteriors and interiors affordable

https://youtu.be/lvlWU1JROD4