I think 3D printing is really interesting, and the possibilities of using the technology in the making of musical instruments seems to have a lot of potential. Maybe not in actually producing the final instruments (yet), but in the development and testing of new designs, etc. For one thing, just imagine the wood that could be saved in one year if prototypes could be developed this way rather than with raw wood. Or if lower end, beginner instruments were made through 3D printing, thereby saving resources for other needs.
Here is a short video with a designer who uses 3D printing to design guitars. Then there is a link to a series of ten videos where an entire band performed with 3D printed instruments.