A town called Gemert in the Netherlands just became home to the first 3D-printed cycling bridge ever. It took its creators at Eindhoven University three months and 800 layers to complete the 26-foot-long bridge, but now it's open and ready to support hundreds of cyclists a day. The researchers had to develop a new 3D printing technique that uses steel reinforcement cables to create pre-stressed concrete. Once they were done laying out all its layers, they tested the bridge by placing a five-ton weight on top of it. Their efforts paid off: while they'll surely improve the method even more, they believe they're now capable of using the technique to build even bigger structures.