Imagine being able to spin virtually any object you print out like a top. Traditionally this would be impossible because the weight distributions of most objects are not adequate. Disney Researchers have come up with a way to make this all possible, however. They have created an algorithm within a software which will vary the amount of infill in an object in certain areas to alter the physics of that object, making it able to be successfully spun around a give axis. More details on this research can be found here: http://3dprint.com/11457/disney-3d-print-spin-top/

Check out the GIF below for just one example of what these 3D prints are capable of. Pretty incredible if you ask me. I could see this being used in a variety of important mechanical applications.