It depends on what you are going to prototype and how complex of the design. With 3D printing development, the process is available for many companies. Benefit from the process, you can verify your design faster and decrease the risk of product failure before moving forward to mass production.
If your design is simple and purpose for proofing your concept, you should use available material for prototyping, try the company or local hardware store around your home, which will be easy for you to follow up. Once you complete the verification, you can start to look for partners locally or oversea to help for your low volume manufacturing or even mass production.
If you are talking about a large and complex prototype, you should think about China. There are lots of Rapid Prototyping Companies such as TEAM Rapid who specializes in prototype manufacturing for years. They understand what you need and can help you to cut down cost without compromising the quality.
TEAM Rapid provides one-stop service to meet your rapid prototyping and low to high volume production needs. 3D printing, CNC machining, rapid tooling & injection molding, pressure die casting, sheet metal fabrication are available in our end. We will help guide your to where you might find the right fit for your needs. Contact us at [email protected] now!