3D printing technology is making tremendous steps forward and even space agencies are more and more interested. ESA and the European Commission have started the AMAZE (Additive Manufacturing Aiming Towards Zero Waste & Efficient Production of High-Tech Metal Products) project, which aims to produce metal components with a 3D printer. ESA aims to send the first 3D printer on the International Space Station to allow the crew to produce tools and metal structures according to their needs of the moment.