Agnikul Cosmos Builds World’s Largest Single-Piece 3D-Printed Rocket Engine, Wins US Patent

 

 

Chennai-based space-tech startup Agnikul Cosmos has unveiled the world’s largest single-piece 3D-printed inconel rocket engine, marking a historic milestone in aerospace innovation and additive manufacturing. The breakthrough engine—manufactured in a single print without welds, joints, or fasteners—sets a global benchmark in 3D printing technology for space exploration.

Revealed via X (formerly Twitter), the one-meter-long rocket engine surpasses previous upper-stage designs, demonstrating unmatched manufacturing precision and engineering scalability. Unlike traditional methods, the process automates the complete engine build, revolutionizing rocket engine production efficiency.

In a further boost to its global aerospace credentials, Agnikul secured a US patent for its Indian-origin single-piece rocket engine design and manufacturing process. The startup emphasized the significance of earning recognition from the US—a leader in space propulsion technology.

Anand Mahindra, Chairman of the Mahindra Group and an early investor, congratulated the team, calling the achievement a source of pride for India’s private space sector.

The breakthrough follows another major success—India’s first electric motor-driven semi-cryogenic rocket engine test-fire. This innovative engine, using liquid oxygen and refined kerosene, replaces conventional gas generators and turbopumps with electric motors for cleaner, more precise thrust control, paving the way for eco-friendly space missions.

Backed by ISRO, IN-SPACe, and the Department of Science and Technology (DST), Agnikul’s advancements showcase the growing power of India’s private space industry in the global arena. The company’s next big step: deploying its Agnibaan launch vehicle, signaling a new era where Indian aerospace startups rival the world’s top space technology innovators.