Microsoft is adding native support for 3D printers to Windows 8.1. That means you don't have to jump through any hoops to 3D print an item—if your computer is hooked up to a 3D printer, you can just hit print.
There have been some rumors floating around that Microsoft would release its own affordable 3D printer, but that's not happening now. What is happening is Microsoft is partnering with a number of existing 3D printing companies—Makerbot, 3D Systems, Form Labs, Autodesk, and several other software and hardware companies. Got a Replicator 2, for example? Or one of 3D System's adorable Cubify machines? You can print things right from your Windows machine. Fabbster's Pesonal 3D Printer and the UP! 3D Printer from PP3D are also initially supported.