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3D Printing Company ExOne: Comparatively Small, Potentially Big. Very Big.

|Includes: DDD, SSYS, ExOne (XONE)

At the moment there are only three U.S. based "pure play" 3D printing companies that are traded publicly:3D Systems (NYSE:DDD), Stratasys (NASDAQ:SSYS), and ExOne (NASDAQ:XONE).

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