These consist of a robotic welding arm that lays down a blob of molten metal, then adds another blob on top of it once it’s hardened, and continues that process until it’s created an entire metal column. By controlling the point in space at which the welds are made, it’s possible to control the orientation of the columns, even getting them to interlace with one another. No supporting materials are needed, and quite large structures can be created.
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