23 Daily — German startup Orbital Matter successfully 3D printed a half-meter rigid beam in the vacuum of space aboard a free-flying satellite in orbit, marking a first for in-space manufacturing of this kind. The demonstration satellite Replicator-2 carried four onboard 3D printers and was deployed during a SpaceX rideshare mission this summer. This breakthrough paves the way for constructing large structures such as orbital data centers in space, according to techcrunch.com.

Technical Approach and Operation of In-Space 3D Printing

Replicator-2’s four 3D printers extrude a custom resin filament, which is cured by ultraviolet light to form a rigid cylindrical beam akin to how cement and water harden. Each printer’s beam length is limited by the resin supply onboard the satellite, with engineers estimating future beams could reach up to 100 meters.

Significance for Future Spacecraft and Infrastructure

Future spacecraft, especially orbital data centers, will require significantly more electrical power generation and heat dissipation. Physical size constraints during launch mean building and assembling large components in orbit could greatly ease these challenges. Orbital Matter is collaborating with the European Space Agency and satellite manufacturer Thales Alenia to mature this technology.

Mission Challenges and Proof of Concept

Of the four printers, two intended to deploy a flexible solar array suffered a failure in one unit, yet the rigid beam that was produced successfully deployed the solar array. This marks the first demonstration of 3D printing rigid structural components in orbit outside of pressurized environments like the International Space Station. CTO Robert Ihnatisin noted the strategy to test multiple printers onboard allowed in-orbit learning and rapid software adaptation instead of prolonged ground testing.

Editor's take: Opportunities for Entrepreneurs and Validation Routes

This advancement lowers barriers to deploying large, complex space structures by enabling in-orbit manufacturing, reducing reliance on pre-launch assembly. For entrepreneurs, expanding commercial space activities can leverage on-demand 3D printing systems to reduce costs and increase mission flexibility. Validation should focus on Orbital Matter’s upcoming 2028 demonstration, testing larger printers on satellites generating 5 kilowatts of power, and analyzing the durability and scalability of their PADS system in diverse mission contexts.