EOS M 400-4 Metal Powder Bed Fusion System

$1,200,000 – $2,000,000 Updated 2026-03-17

Key Specifications

Build Volume (X×Y×Z)

400 x 400 x 400 mm

Layer Thickness

20 – 100 µm

Laser Power

4 x 400W fiber lasers

Number of Lasers

Build Rate

Up to 100 cm³/h (material-dependent)

Materials

Ti-6Al-4V, AlSi10Mg, IN625, IN718, 316L, CoCr, MS1 maraging steel

Overview

The EOS M 400-4 is EOS GmbH's flagship large-format metal powder bed fusion (LPBF) system, designed for high-throughput industrial production of complex metal components in aerospace, automotive, energy, and industrial sectors. The machine features a 400 x 400 x 400 mm build volume with four 400W fiber lasers operating simultaneously across the powder bed, each with independent scan control. This quad-laser architecture enables build rates that approach four times the throughput of equivalent single-laser systems, fundamentally changing the economics of metal AM for production applications.

EOS developed the M 400-4 for manufacturing operations where part volume and production speed are as important as geometric capability. Each of the four lasers covers an assigned zone of the build platform, with overlap regions managed by EOS's multi-laser exposure software to prevent seam artifacts at zone boundaries. The result is a consistent, dense microstructure across the full 400 mm build platform, verified to meet the same material property benchmarks as single-laser EOS systems.

The machine's open-architecture materials system allows EOS Direct Metal Laser Sintering (DMLS) parameter sets across a wide range of qualified alloys including titanium (Ti-6Al-4V), aluminum (AlSi10Mg), stainless steel (316L), nickel superalloys (IN625, IN718), cobalt-chrome, and tool steels (MS1 maraging steel). EOS's EOSPRINT 2 software handles build preparation, nesting, and process parameter management, providing a data-driven workflow from CAD to machine.

For production environments, the M 400-4 supports integration with EOS's AMCM automation platform and powder handling modules, enabling semi-automated powder loading, sieving, and part extraction to reduce operator touchtime and improve process repeatability. The machine is the production backbone of many aerospace prime contractors and tier-1 suppliers who have qualified EOS platforms for flight-critical and space-grade component manufacturing.

Full Specifications

Parameter	Value
Build Volume (X×Y×Z)	400 x 400 x 400 mm
Layer Thickness	20 – 100 µm
Laser Power	4 x 400W fiber lasers
Number Of Lasers	4
Build Rate	Up to 100 cm³/h (material-dependent)
Materials	Ti-6Al-4V, AlSi10Mg, IN625, IN718, 316L, CoCr, MS1 maraging steel
Accuracy	±0.1 mm or ±0.1% (whichever is greater)
Machine Weight	Approx. 4,500 kg

Specifications sourced from eos.info — verified 2026-03-28

Strengths & Limitations

Strengths

Quad 400W laser architecture delivers up to 4x throughput versus single-laser systems at equivalent build volume
400 x 400 x 400 mm build envelope handles large structural components and high-density part nesting
Broad qualified materials portfolio covers titanium, aluminum, nickel superalloys, CoCr, and tool steels
EOS EOSPRINT 2 software provides data-driven build preparation with multi-laser zone management
AMCM automation platform integration enables semi-automated powder handling for production environments

Limitations

Very high capital cost — among the highest in the LPBF market for systems of this class
Large machine footprint and 4,500 kg weight require significant facility planning
Multi-laser zone boundary management requires careful EOSPRINT parameter setup to avoid seam artifacts
Post-processing (heat treatment, support removal, machining) adds significant total cycle time and cost

Best For

Aerospace prime contractors and tier-1 suppliers producing flight-critical structural components in titanium and nickel superalloys High-volume industrial manufacturers requiring maximum build throughput from LPBF metal AM equipment Production facilities building EOS-qualified material and process databases for regulated industry certification

Frequently Asked Questions

01 How does the M 400-4's quad-laser system avoid seam artifacts between laser zones?

EOS's multi-laser exposure software in EOSPRINT 2 manages overlapping scan zones between adjacent lasers. The software applies specific scan strategies in the overlap region — including staggered scan vectors and optimized energy parameters — to ensure the fusion boundary between laser zones achieves the same density and microstructure as the single-laser zones. EOS has validated this through mechanical testing across numerous materials and part geometries.

02 What industries have qualified the EOS M 400-4 for production use?

The EOS M 400-4 has been qualified for production by aerospace manufacturers (structural brackets, fuel system components, engine hardware), space companies (satellite structures, propulsion components), and energy sector OEMs (turbine components, heat exchangers). Its process consistency and broad materials qualification database make it one of the most widely qualified LPBF platforms in regulated industries.

03 Can the M 400-4 process reactive materials like titanium safely?

Yes. The M 400-4 operates under an inert argon atmosphere with oxygen monitoring to maintain safe processing conditions for reactive metals including titanium and aluminum. The inert gas system continuously circulates and filters the atmosphere during the build to maintain oxygen levels low enough to prevent contamination of the metal powder bed and solidified part surfaces.