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    • They basically don’t? Contour Crafting is in proof-of-concept phase, but the idea is, imagine a 3D printer bigger than a house. It has 2 things it can do: it has an extruder, like a plastic 3D printer, with a substance designed to be extrudable but which will behave like concrete when it’s laid down. And there’s a little gripper. So ideally what happens is the machine lays down an outer structure, the same way humans would lay an outside structure of a house - laying down part of a wall, then sticks in a window, then lays down the rest of the wall. So it won’t 3D print a window, because it’s almost certainly not worth it to 3D print that onsite. The structure of the house responds to the environment. For example, the foundation of our new house is bespoke to that hill, but windows are always windows. You can have the extruder fire up, the gripper put pieces in place, and the fantasy is you’ll have a house in a few days without expensive humans to do the labor.