For decades, Americans worried about our manufacturing sector. People believed U.S.-made goods were too expensive or poorly made.

Production-ready, 3D-printed automotive parts have been slowly entering the market the past few years. Now, they’re as important as the thousands of metal and plastic parts produced using traditional casting, injection molding, stamping and machining processes.

Automakers are scrambling to build a new generation of vehicles that are intelligent, connected and electrified. That’s forcing engineers to rethink how traditional assembly lines and production processes function.

Consumers spend some $1 billion to buy 2 billion lightbulbs each year in the U.S. That’s more than 6 million every day. High-speed automated assembly is the only way to meet that kind of volume.

How quickly things change. On March 1, I was one of 15,000 people watching the Chicago Cubs play a spring training game at a ballpark in Mesa, AZ. It was warm and sunny, the beer was cold, and I had not a care in the world.