The promise of a 3D printing revolution has to be proved. To make it a revolution, we have to deal with some uncomfortable questions first. For some, it is 3D printing. For others, it is open source. For others, it's digitization, or it is the power of networks, or disruption from below. They all are right. For many years now, different kind of people claim that 3D printing will revolutionize our world. But 3D printing is still time consuming and costly. That's why proponents of 3D printing tend to compare the development of 3D printers with the development and distribution of personal computers. Regardless these technical matters, 3D printing raises questions that go far beyond: To what extent is independence of mass production possible? And if, could 3D printing be more sustainable than mass production?