Out today from Microsoft is a 3D-printing application called 3D Builder that will help the amateur set dig into 3D printing, provided that they 1) have a Windows 8.1 machine, and 2) have a Windows 8.1-ready 3D printer.So, it's a small group. But that's just fine. Every technology has an incubation phase apart from the mainstream, and 3D printing is only now enjoying public awareness, let alone mass adoption.Windows 8.1 was designed to support 3D ...