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Although there are several methods of 3D-printing metal objects, all of them involve heat – which isn't conducive to producing heat-sensitive electronics, among other things. A new gel, however, can be used to print such items at room temperature. https://newatlas.com/3d-printing/copper-gel-3d-printed-metal-room-temperature/
@estherschindler good luck finding gallium, but cool none the less.