http://www.forbes.com/sites/tjmccue/2012/04/02/3d-printed-guitar-takes-instrument-design-to-new-level/
TJ McCue at Forbes posted an article about One.61, a New Zealand company that does product development work, including a foray into 3D printing.
Although we have not worked with anyone for product development, the UR CTLT does have connections with a few services that will do one-off/prototype fabrication and/or design.