3D Modeling

So for those of you who have used or have access to a 3D modeling suite like Autodesk Inventor, you are probably aware of the capabilities of this software. For those of you who dont, here is a little example. The wheel I created out of 6061 aluminum weighed 2.71 ounces. Inventor says it should weigh 2.704 ounces. Really amazing. Guess I need to work on my machining skills!