After integrating native 3D-printing support into Windows 8.1 and partnering with Stratasys-owned Makerbot to sell Replicators in Microsoft stores, Microsoft has released its first 3D printing app for Windows 8.1. 3D Builder appears to be a user-friendly interface for printing objects from your Windows device, essentially a Microsoft solution for making use of the native 3D printing capabilities of the OS.
The GeekWire video below demonstrates the app to be something not much more than Repetier-Host or MakerWare. With it, you can orient and scale your 3D models for printing. What they’ve added is a library of 3D objects, such as toy trains, cookie cutters, a money clip and buttons so that, presumably, if you can’t figure out how to use Thingiverse, you can simply print one of their pre-made items. Of course, if you do know how to use Thingiverse or can create a 3D model on your own, you’ll be able to print those items from 3D Builder as well.