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

The engine has been printed in one go without any welds, joints, or fasteners, representing a revolutionary breakthrough in aerospace.

Agnikul Cosmos is an Indian private aerospace manufacturer and commercial launch service provider based in the National Centre for Combustion Research Development (NCCRD) of IIT Madras, Chennai.

The company announced this milestone through their X page with the title, “two updates” on August 6, 2025. “This milestone marks a breakthrough in additive manufacturing at this scale,” the company wrote, emphasising its significance and speciality of the rocket engine.

Following it, they announced another milestone, achieving the US patent for the design and manufacturing process of a single-piece rocket engine. “Means something to have a completely Indian origin design patented in the US - a nation that has built some of the most complex engines in this industry”, the company wrote, while thanking ISRO, Inspace, Technology Development Board, and DST India for supporting them.

Reportedly, Agnikul’s journey began in 2017, in Madras. After years of research and development, they successfully test-fired their first 3D printed engine, the Agnilet, in 2022.