which also heats the wire with high current instead of an arc.
The printer is actually a FDM 3D printer built from an old microwave oven transformer and some other not special parts, which prints with welding wire instead of plastic filament. The only difference to a normal plastic FDM printer is, that the heat (around 1450°C) is created by high current flowing trough thin wire instead of plastic filament melting in a heated nozzle.
The printer is also suitable for welding/heating small metal parts.
JFYI: his is called "WAAM" - Wire arc additive manufacturing.