MAPLE PLAIN, Minn.--(BUSINESS WIRE)--Proto Labs, Inc. (NYSE:PRLB) has introduced magnesium injection molding into its current rapid manufacturing services. This advanced injection molding process enables product designers and engineers to prototype using the same materials and processes used for the final part production. In addition to prototypes, Proto Labs will offer production parts in quantities of up to 5,000+ with a typical turnaround time of 15 days. Magnesium is a strong and lightweigh