3D printing is a powerful tool to learn, collaborate, tinker, and experiment. We are delighted to learn that the „Bücherhallen Hamburg“ have acquired a 3d printer that can be used by the general public for free. Whatever will become of libraries in a (not so far?) digital future, I hope they will remain public places (a „BA„) that enable the sharing and creation of knowledge. This is one of they many ways in which that can happen.