3d printing of metal using a rocket engine

“Instead of using a laser and heat to melt the metal powder and form the metal part — a very expensive and slow process — we use a rocket engine and deposit metal powders at extremely high velocity,” Mr Camilleri said.

I recently read, that NASA also has been making and evaluating durable 3D printed rocket parts made of one metal, but the technique of 3D printing, or additive manufacturing, with more than one metal is more difficult.