MAPLE PLAIN, Minn.--(BUSINESS WIRE)--Proto Labs, Inc. (NYSE:PRLB), a leading online and technology-enabled quick-turn, on-demand manufacturer, today announced that it will be presenting at the William Blair & Company 35th Annual Growth Stock Conference on Tuesday, June 9 at 5:10 p.m. ET. The conference will be hosted in Chicago and attendance to the conference is by invitation only. Proto Labs’ Victoria Holt, President and CEO, and John Way, CFO, will review the company’s current business d