Summary
The European Space Agency’s metal 3D printer has produced a fifth test sample aboard the International Space Station. Researchers will compare the orbital print with matching samples made on Earth as they assess whether crews can reliably manufacture tools and replacement parts away from the planet.
The first metal 3D printer operated in orbit has completed its fifth sample aboard the International Space Station, the European Space Agency said on July 21, 2026.
ESA astronaut Sophie Adenot removed the sample during the agency’s εpsilon mission and prepared the printer for its next test. The finished piece returned to Earth aboard SpaceX’s CRS-34 cargo spacecraft and is scheduled for examination at ESA’s technical center in the Netherlands and the German Aerospace Center.
The printer reached the space station in 2024 as a technology demonstration. Airbus Defence and Space led the industrial team that developed it under an ESA contract, while the French space agency’s CADMOS center operates it with support from ESA and Airbus.
Comparing orbital and ground-made metal
Three earlier samples have already returned to Earth for analysis at ESA and the Technical University of Denmark. Researchers are comparing their large-scale shape and microscopic material characteristics with reference pieces produced on the ground using the same printer.
Each print is designed to test a different part of the manufacturing process. ESA said results from the returned samples will help teams understand the printer’s limits, improve print quality and design procedures that work for both astronauts and ground operators.
The next planned activity will also test recovery from a problem. Adenot installed a baseplate holding a partially printed element after an anomaly stopped an earlier attempt. Teams intend to test a recovery procedure and resume that print later in 2026.
Why in-orbit manufacturing matters
The International Space Station orbits about 400 kilometers, or roughly 250 miles, above Earth and can receive regular cargo deliveries. Missions farther from Earth would face longer delays and fewer opportunities for resupply. Reliable onboard manufacturing could allow crews to produce a needed part instead of carrying every possible spare.
The project remains experimental. ESA has not said the current printer can manufacture certified replacement parts for operational spacecraft, and the fifth sample’s detailed test results were not available in the announcement reviewed by WSOI.
Key Facts
- ESA’s orbital metal printer has completed five test samples.
- The fifth sample returned to Earth aboard the CRS-34 cargo spacecraft.
- Researchers compare orbital samples with matching prints produced on Earth.
- A later 2026 test is expected to attempt recovery from a stopped print.
- The system is a technology demonstration, not a production manufacturing service.