This is a link top a new 3D cad program from Autodesk (Autocad, Inventor etc.). I haven't looked at it so I can say if it is any good, just read to description but it is a free download. It is designed to be outputted to a 3d printer if you want to have a part prototyped.
http://news.autodesk.com/news/autode...-Free-Download
http://news.autodesk.com/news/autode...-Free-Download
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