I don't know that much about watches, but I do know about producing intricate precision parts and I have experience with 3D printing.
I do not believe that currently parts could be produced to the tolerances and surface finishes required with 3D printing alone. I'm sure this will change, but it's a way off yet.
Just my opinion obviously and if anyone has any evidence to the contrary I would be interested to hear.
Sent from my iPhone using TZ-UK mobile app