This is a video roundup of currently available or prototyped 3D printers, a gadget which has been sitting on the sidelines for a while, but hasn’t become mainstream yet. 3D printing machines are fairly simple in their operation, building any 3D shape, no matter how complex, as a series of contour slices which are hardened as a printer head slides back and forth across. But the results look like magic, real objects, in color, with moving parts, direct from a CAD model. The main reason that 3D printers, still remain a professional niche product, used by design firms rather than end consumers, is that their output is small and slow. In addition, more people know how to create text files for 2D printers than a CAD design, and this is unlikely to change in the near future. As a result of this small market, some of the marketing videos of 3D printers shown here look distinctly old fashioned for such a futuristic product. We long for the day when we will be able to print a full sized chair in ten minutes.