If that's the case that reaming is needed anyways, then the rapid prototyping of choice would be machining rather than 3D printing.

3D printing is still generally misunderstood by the public as to what you can realistically fabricate with performance features that come close to more traditional manufacturing. Not even close to making actual guitars with it. Re read the article and you will see that this is a traditional guitar with just the cosmetic body shape printed. The heart of the guitar is wood as well as the neck. The "brighter" comment in the article is because of the lack of resonance in the printed structure.

My Songs, photos, writing,etc.
My Sound Cloud