"Meet 3D Builder - the best place to view, prepare, and print your 3D models on Windows 8.1-ready 3D printers! 3D Builder is a fun, easy to use, free app that helps you turn bits into atoms and explore the exciting world of 3D printing. It also includes a library of example 3D objects to get you started. Whether you are an experienced enthusiast or new to the world of 3D printing, 3D Builder is fun for Makers of all ages."
Link to download it.