Opinions expressed by Entrepreneur contributors are their own. Amazon Fire Phone, Google Glass, New Coke and Nintendo’s Virtual Boy: What do all these products have in common? They didn’t sell.

Building hardware is rarely a straight path from idea to finished product. Most teams begin with a rough concept, test ...

How to work out a prototyping strategy that eases the transition to mass production. The advantages of using data from devices in the field to improve designs over time. How to make products more ...

At the PARI Hypersonics Advanced Manufacturing Technology Center (HAMTC), from left: Nate Humbert, lead additive manufacturing engineer, GE Additive; Will DeVerter, aeronautics and astronautics ...