Agnite-World’s largest single-piece 3D-printed rocket booster engine

India’s private space startup Agnikul Cosmos has successfully test-fired “Agnite,” the world’s largest single-piece 3D-printed rocket booster engine, marking a major milestone in rapid rocket manufacturing.

The Agnite engine, about one metre in length, has been manufactured as a single-piece structure using Inconel, a high-performance alloy capable of withstanding extreme temperatures. This makes it the largest engine of its kind produced through 3D printing technology.

Traditionally, rocket engines require months of machining, welding, and assembly of multiple components. However, Agnikul’s innovative approach eliminates these steps, allowing the entire engine to be built in just seven days—reducing production time by up to 90–97%.

Another key innovation is the use of electric motor-driven pumps, replacing conventional gas-generator systems. This design simplifies the engine architecture and reduces mechanical complexity, enhancing efficiency and reliability.

Incubated at IIT Madras, the startup—valued at over $500 million—is rapidly establishing itself as a major player in India’s growing private space sector. Its Agnibaan launch vehicle is being developed to provide on-demand launches for small satellites, a market witnessing rapid global expansion.