HP has just revealed a lot more information about the 3D printing technology it teased dramatically a few months ago. It's called "Multi Jet Fusion," and the company thinks it can "change entire industries." The original goal was to make 3D printers build objects at higher resolution and much, much faster, speeds. Based on the demos we saw today, that claim looks feasible. Essentially, the 3D printer builds parts similar to how an inkjet printer produces documents -- the "ink" is applied to a material coating, then heated and fused to build up layers (see below). That's substantially different to how mainstream 3D printers work, and HP said that it could make products like gears at least ten times faster than conventional manufacturing techniques.