From RedEyeOnDemand
Turning a 1968 Fastback into a GT500E-inspired Mustang took more than a little elbow grease. A 3D scan of the Mustang was the first in a series of eight steps leading to a model that could be produced with rapid prototyping. Nine components were created: two pair of side scoops, two hood scoops, front grill, rear bumper and center console. For the steps from sketch to finished product, click on the link above.
An overview and selection guide of prototyping processes for product development applications.
A quick-reference user guide for rapid injection molding for engineers and designers.
Protomold provides injection molded prototypes, production parts or bridge tooling in as little as 1 business day.

The switch to plastic allows this designer to make a better shallow water paddle.
Firstcut is can deliver fully machined prototypes, parts, tooling and other "one-off" projects in as little as a day.
Proto Labs specializes in fast delivery of functional parts for prototyping, testing, or short-run production of CNC machined and injection molded parts.