Since the idea of 3D-printing towing tank models raised, our team has worked hard to accomplish what we already have achieved. During the project kick-off in October 2015 we were uninformed and even a bit naïve but in the months after it all went off without a hitch. We knew our targets and we learned every day. We visited dozens of companies and wrote hundreds of e-mails. At first, we acted slightly mysterious about our vision. Later we switched to almost full transparency. Nobody told us it was impossible..