From the blog "3D Printing in Medicine"

UPDATED TUTORIAL: A Ridiculously Easily Way to Convert CT Scans to 3D Printable Bone STL Models for Free in Minutes Hello, it's Dr. Mike here again with another tutorial on 3D printing. Proprietary software that creates 3D printable models from medical scans typically costs tens of thousands of dollars to license. But, did you know that you can do the same thing using freeware? It's true! In this tutorial I'm going to show you exactly how to do this.   We will be using the free,