 MAPLE PLAIN, Minn.--BUSINESS WIRE--Proto Labs, Inc. NYSE: PRLB, the worlds largest ecommerce manufacturer and supplier of on-demand prototype and production parts, today announced financial results for the second quarter ended June 30, 2021. Second Quarter 2021 Highlights include: Revenue for the second quarter of 2021 was 123.0 million, representing a 15.5 percent increase compared to revenue of 106.6 million in the second quarter of 2020. Hubs generated 8.9 million of revenue in the s 