Engineering | innovation | Innovation to go? Every year thousands of people visit our test tower for elevators in Rottweil, North Rhine-Westphalia in Germany. Now visitors can get their hands on a miniature version of our tower. The new souvenir is not only nice to look at: it bears a lot of innovative 3D-print technology in its' 127,94 millimeters and 15 grams made of thermoplastic.