Shares of 3-D Printing companies had a wild ride at the beginning of the week. Stratasys (SSYS +1.39%) and ExOne (XONE +0.00%) shares were both down by as much 10% Monday, while shareholders of 3D Systems (DDD +2.00%) watched their holdings drop as much as 8%.
In this video, Motley Fool contributor Brian Stoffel explains what caused the drop, and why long-term investors need not worry about recent volatility.
