Proto Labs has become well-known in the 3D printing industry, but the company, which was established in 1999, has actually only been in the 3D printing business for a few years. Before that, it was known for rapid prototyping via injection molding, and despite the fact that it has added CNC machining as well as 3D printing to its repertoire, injection molding hasn't been neglected in recent years - in fact, that aspect of Proto Labs' business is doing better than ever. Read more at 3DPrint.com: http://3dprint.com/181245/proto-labs...and-metrology/