3D Printing anyone?

Now this is a novel technique to print in 3D:“Chemical origami” shrinks 2D discs into 3D objects (February 2007) – News – PhysicsWeb
Most approaches rely on an addition or subtraction method.  This one is more focused on morphing.  The potentially interesting part about the morphing approach is that it would allow you to create some objects that aren’t possible through addition/subtraction.