Rocket Lab completes 1,000th 3D-printed Rutherford engine, scaling AM production for space

Rocket Lab has reached a production milestone for its Rutherford engine, completing the 1,000th unit off its manufacturing line at its Long Beach, California facility. The Rutherford is the world’s first 3D-printed, electric pump-fed orbital rocket engine, producing 24 kN of thrust per unit. Nine sea-level Rutherfords power the Electron launch vehicle’s first stage, while a vacuum-optimized variant drives the second stage. Rocket Lab manufactures the engine’s combustion chamber, injectors, pumps, and main propellant valves using in-house metal LPBF systems from EOS, Nikon SLM Solutions, and Renishaw, with Carpenter Technology supplying metal powders. The production rate has scaled from roughly one engine per month in 2017 to a target of about 200 units annually, with over 800 engines already flown to space across more than 70 successful Electron launches.

This milestone places the Rutherford among the most manufactured rocket engines on Earth and demonstrates that additive manufacturing can sustain serial production at aerospace-grade quality and volume. The achievement fits the aerospace qualification grind pattern: Rocket Lab embedded AM into the engine architecture from the start in 2013, and the technology has now become invisible infrastructure — the engine is simply produced, not marketed as a 3D-printed novelty. The production scalability depends directly on the 24-hour print cycle for primary components, which bypasses the long lead times of conventional casting and machining. This contrasts with programs like GE’s LEAP fuel nozzle, where AM success also disappeared from marketing language once embedded. For the broader metal AM industry, the Rutherford program provides a rare data point on sustained production throughput — roughly 200 engines per year — that few other AM applications have matched, especially in the demanding aerospace vertical.

For Rocket Lab, the immediate operational priority is maintaining quality consistency as it pushes toward its stated goal of 1,000 engines produced by year-end. The same AM-first philosophy is already being applied to the Archimedes engine for the Neutron vehicle, which features 3D-printed turbo pump housings, thrust chamber, and valve housings. Buyers and investors should note that the Rutherford’s production volume is now a proven benchmark, not a promise — the company has demonstrated that AM can deliver repeatable, qualified hardware at scale in a program where engine reliability directly determines mission success. The next test is whether that manufacturing discipline transfers cleanly to Archimedes as Neutron moves toward first flight.