I like infographics, and here’s one that gives a very general overview of 3D printing. It doesn’t provide a lot of information, and tries to cover too broad a spectrum, but you may find it interesting. It provides a basic overview of how 3D printing works, the industry and charts on 3D printer stocks.
The creator of the infographic is HighTable.com.
Source: BusinessInsider.com; h/t: On3DPrinting.com