Charlotte: Australia’s Spider-Like Robot That Can Build a House in a Day In Australia, engineers at Crest Robotics and Earthbuilt Technology have developed Charlotte — a spider-like autonomous robot capable of 3D-printing a full 2,150-square-foot house in just 24 hours. Operating with precision and speed comparable to around 100 human bricklayers, the system represents a significant leap in automated construction. Charlotte uses a sustainable composite material made from sand, crushed brick, and