From cnet.com:

A 3D-printed violin is just one of a suite of instruments designed to provide a collaborative experience exploring our relationship with sound.
It may look a little (or a lot) like a Klingon weapon, but this sleek 3D-printed object is actually a musical instrument — in fact, it’s a species of violin.
The differences aren’t just cosmetic. The traditional four strings have been reduced to just two, and the sweeping shape of the piezoelectric instrument’s body is a far cry from the curves of a traditional violin. The structures therein serve to amplify its acoustics in new ways.