The New York-based federally registered investment adviser ARK Investment Management has just launched The 3D Printing Exchange-Traded Fund (Bats: PRNT), the first-ever ETF in the United States to focus primarily on the 3D printing ecosystem. With this new ETF, which trades just like a common stock on the exchange would, will span many relevant sectors, including 3D printing technology, CAD software, 3D scanning, materials, and service centers. ARK estimates that the 3D printing industry could surpass $40 billion in value by 2020, and $490 billion in 2025. Read more at