They were designed with its Noyron Large Computational Engineering Model and 3D printed with a high-temperature copper alloy.
Morning Overview on MSN

Who invented the modern rocket engine?

Modern spaceflight rests on a deceptively simple idea: a machine that carries its own fuel and oxidizer, then hurls exhaust ...
Former SpaceX propulsion lead Tom Mueller discusses Falcon 9 engine development, SpaceX's iteration culture, and Impulse ...
LEAP 71 hot-fires two orbital-class methalox engines. The engines were designed entirely without human intervention by Noyron.