The machines have been available for two decades, but only recently have they approached affordability. The six 3D printers in daily use at Omnica are costly industrial models, but is it now possible to purchase a consumer version for less than the price of a good table saw.
   You can get started more reasonably by loading free 3D modeling software on your laptop and start designing. There are a number of service bureaus that can print plastic, ceramic, or metal models from your 3D files. If learning a new program sounds like too much work, use your smartphone as a handheld scanner.    

   We are surrounded with 3D printed products - orthodontic braces, jewelry, and 3D-printed joints and bones to name a few. NASA is hoping to print parts while in orbit, and make tools for space travelers from lunar dust. Someday, we may be able to improve our health and perhaps extend longevity with manufactured internal organs from a company who currently prints human tissue.