The construction industry is undergoing a significant transformation, driven by advancements in technology. Among these innovations, 3D printing technology stands out as a game-changer, particularly in the realm of infrastructure. Arup, a global engineering and design consultancy, has been at the forefront of this revolution, notably through its involvement in the MX3D Bridge project in Amsterdam. This article explores how Arup employs 3D printing technology for steel bridge​ construction, detailing the design, challenges, and implications of this groundbreaking project.