EOS M4 Onyx Brings Six Lasers to Industrial-Scale Metal 3D Printing

EOS shows its case for production metal AM at IMTS

Metal 3D printing has long sat in a uncomfortable position: good enough for prototypes and low-volume aerospace parts, but not competitive with conventional manufacturing when the order count climbs into the hundreds. EOS is using IMTS 2026 to argue that gap is closing. Its M4 Onyx system, a six-laser metal 3D printer with a 450 by 450 by 400 mm build volume, is designed specifically for high-volume serial production, not just one-off parts.

Six lasers, one large build chamber

The M4 Onyx deploys six 400-W fiber lasers across its build platform. More lasers mean the system can work on multiple sections of a build simultaneously, cutting the time per layer and raising overall throughput. The 450 mm square build area gives manufacturers room to nest multiple parts in a single job, which further improves the cost per component. That combination is what EOS is targeting: manufacturers that want to produce metal parts in quantity, not just produce them in metal.

Automated changeovers in under 30 minutes

Serial production only works if the machine spends most of its time building, not being set up for the next job. EOS says the M4 Onyx can complete automated job changeovers in less than 30 minutes. That matters in production environments where additive manufacturing systems are expected to run continuously. Faster changeovers mean higher machine utilisation and fewer gaps in the production schedule.

Process stability is equally central to EOS's pitch. The M4 Onyx uses advanced process controls, optimised gas flow and active temperature management to keep conditions consistent across the build platform. Stable thermal and atmospheric conditions are critical for producing repeatable part properties and dimensional quality, especially in regulated industries like aerospace and medical devices where batch-to-batch variation cannot be tolerated.

RFS Pro cuts consumable waste

Powder represents a significant cost in metal additive manufacturing. EOS is highlighting its RFS Pro filtration technology alongside the M4 Onyx. The system is designed to eliminate conventional filter consumables and recover more than 90% of the metal powder used in a build. Higher powder recovery reduces operating costs and cuts the hazardous waste stream that conventional filtration produces. For a system running multiple builds per week, that powder recovery adds up quickly.

Production-scale parts on display

At IMTS, EOS is demonstrating the M4 Onyx with examples that show where the system sits in the production chain. The list includes a Boom Supersonic engine component, a Beehive Fury drone engine, and a rocket nozzle produced on an AMCM M 8K system. These are not parts chosen for their simplicity. They are complex, load-bearing components that previously required extensive machining, tooling or assembly. If metal AM can produce these dependably at scale, the addressable market for systems like the M4 Onyx is substantial.

The metal AM production race is real

EOS is not the only company pushing hard on high-volume metal AM right now. Trumpf, DMG Mori and GE Additive are all working on multi-laser, large-format metal systems. The M4 Onyx is EOS's answer to that pressure, and it is a clear upgrade from the company's earlier production-focused platforms. Whether it outsells its competitors will depend on pricing, support infrastructure, and how quickly manufacturers are willing to trust serial AM for production parts. At IMTS 2026, the case for that trust is being made out in the open.