How metal can now be 3D printed (additive manufacturing?) like you can with by dripping plastic layer by layer and it dries up over time?
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There are multiple methods.
The motion system can be a regular 3d printer, an articulated industrial robot, or anything else that moves how you need it to, like CNC machining equipment.
The metal can be deposited directly at a single point, like sticking a MIG welder on your motion system and continually building up layers, a more advanced version that sprays powdered metal and melts it with a laser, a filament or resin with metal particles mixed in(that then get put in an oven to sinter after printing), or you can have a bed of powdered metal where a laser melts one layer of metal, then spreads another layer of powder on top before melting the next layer.
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