David Leach mops the floor of a 3D-printed concrete home built by VeroTouch in Buena Vista, Colo., on Feb. 19, 2025. (AP Photo/Thomas Peipert) ...

there’s technology to 3D print homes. A computer-controlled robotic arm equipped with a hose and nozzle moves back and forth, oozing lines of concrete, one on top of the other, as it builds up ...