Scott Summit does unusual things on his vacations. For instance, he just spent a week up in the mountains, taking in the majestic scenery and all that, but also sitting at his laptop creating a 3D model of his ideal guitar. Then he sent the computer design to 3D Systems, which used its massive 3D printers to transform the graphic model into an actual acoustic instrument that Summit can play.
As far as anyone seems to know, this is the first 3D-printed acoustic guitar on the planet, and it raises all kinds musical possibilities. (As several readers noted, people have already made 3D printed electric guitars.)