Yes, you are reading right. The leader in 3D and Visualization tools bring to "people" a design application, complete with pushbutton 3-D printing services. Autodesk 123D beta differs from other free 3-D modeling software like Google Sketchup in that it's designed to let you easily fabricate objects, not just visualize them. The software's "Make It" link will let you push your 3-D file to fabricating partners.
123D have „inside“ shell command which turns any digital model hollow, this feature make it much faster and cheaper to print. Of course high-end modeling is possible as well. 123D includes also a massive library of over 4,000 prefab components to play and build with: common shapes and objects, screws, bolts, pins, even entire rooms and more features...
Autodesk 123D is windows based application only, but the developers promise to include this to Mac OS, mobile or tablet.
Source and full article: Fastcodesign