NASA says that Electronic Alchemy’s eForge 3D printer is another space program spinoff. The printer looks a lot like a conventional 3D printer but unlike its mundane cousin it can print sensors, lights, and other electronic components. It does that by using one of six or eight different materials.
Six of the eight spools each have some sort of electronic property. According to the company they have conductive filament, resistive filament, insulating filament, capacitive filament, and both N- and P-type semiconductors.