How Everything Is Made on Instagram: "In the 1930s, a few pioneering builders experimented with houses constructed by machines that poured concrete in continuous, layered forms — functioning almost like an early precursor to modern 3D printing. Instead of stacking bricks or erecting wooden frames, these systems used slip-form or contour-crafting–style rigs that traveled along rails, shaping walls directly on-site as they deposited wet concrete. This technique made it possible to create flowing c

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