How Things Work on Instagram: "The strength of a 3D-printed house comes from material composition, layer geometry, and continuous wall design, not from the printer alone. Most printed houses use cement-based mixes with fibers and additives that control cracking and increase tensile strength. The printer lays material in thick, interlocking layers that form continuous walls, reducing weak joints found in traditional block construction. Steel rebar, cables, or post-tensioning are often added insid