In the Netherlands, MX3D, a 3D-printing robotics company, is currently working on building a fully functional, intricate pedestrian steel bridge across the Amsterdam canal using a 6-axis robot equipped with 3D printing tools.526 With intelligent software and further innovations in engineering, materials and technology, 3D printers will be able to build larger scale structures, such as roads, bridges and tunnels, at twice the speed of conventional methods and reaching the world's most remote locations. Its adoption in developing countries will depend not only on its availability and affordability, but also on the absorptive capacities of SMEs that go hand-in-hand with their access to skilled workers. Public sector retrenchment in infrastructure has opened the door to private sector participation in infrastructure financing and management. They can provide a way for governments to access sophisticated technology and innovation held by the private sector and to improve transport networks and services.