Purely History on Instagram: "Long before modern 3D printing became mainstream, the idea was already taking shape in the 1930s. Inventors and builders began experimenting with automated machines that could lay concrete in layers, a process strikingly similar to how today’s 3D construction printers operate. One well-known example is R. Buckminster Fuller’s Dymaxion house, though other innovators also developed mechanized systems designed to extrude concrete in controlled patterns. These early exp