It gives you very simple library and very simple resizing commands. It is extension of the 3d printing support released recently for Windows 8.1. There will be many opinions about this, but it is step forward. Step by step 3d printing is getting everywhere.
I had trouble installing 3d Builder app on my PC for some time, probably because of my region. It works now.
Video by: http://www.youtube.com/user/GeekWire