I have extensive hands on experience in prototyping for startups using 3D printers, micron accuracy computer controlled milling machines, power tools, hand tools, etc.

Here are some pointers:
You can buy your own 3D printer (I'd recommend Afinia: http://afinia.com/), or you could send your CAD design to http://www.shapeways.com/ to have them print it for you.

If your design can be made from 2 dimensional pieces, then you could also get it made by a laser / water jet cutting place, such as http://www.bigbluesaw.com/

If you'd like further information about how to do it yourself, other manufacturers, the best CAD software, the limitations of each prototype manufacturing method, or information on the best materials to use for different conditions, send me a message and we can work out a call,

all the best,

Lee