3D printing monuments or buildings

On this site (http://osmbuildings.org) there is a button that allows you to extract a model of the building or the monument and then send it to a 3D printing service. Here the model of the Berlin TV tower ready to be printed: https://3d-button.com/en/uploads/ec751af1-cb94-4151-b5b2-a0e9cff23e00/