EOS M 400-4

$1,500,000 - $2,500,000 Updated 2026-03-11

Key Specifications

build volume

400 x 400 x 400* mm (15.7 x 15.7 x 15.7 in)

laser type

Yb-fiber laser; 4 x 400 W

laser power

4 x 400 W

number of lasers

scan speed

up to 7.0 m/s (23.0 ft/s)

focus diameter

approx. 90 µm (0.00354 in)

Overview

The EOS M 400-4 is the production-scale flagship of the EOS metal additive manufacturing lineup. With four independent 400 W Yb-fiber lasers working a 400 x 400 x 400 mm build volume, this system delivers up to four times the throughput of the single-laser M 290 while maintaining the same DMLS part quality that has made EOS the standard in regulated industries. If you need to move from prototyping to serial production of large metal components, the M 400-4 is the platform that aerospace and energy OEMs have standardized on.

Each of the four lasers covers a 250 x 250 mm quadrant with 50 mm overlap zones, and EOS's overlap stitching algorithms ensure seamless material properties across laser boundaries. The scan speed reaches 7.0 m/s per laser, and the four high-speed scanners work simultaneously to dramatically cut build times on large cross-section parts. Focus diameter is approximately 100 microns, matching the M 290's detail resolution while scaling up the productive area by 2.56x.

The M 400-4 supports EOS's full portfolio of metal materials including aluminum alloys, titanium Ti6Al4V, Inconel 718 and 625, stainless steels, and tool steels. The machine ships with EOSPRINT build preparation software and EOSTATE real-time monitoring for melt pool surveillance, powder bed quality, and system status tracking. For aerospace customers, this level of in-process monitoring is non-negotiable for flight-critical hardware.

At an estimated $1.5M-$2.5M fully configured, the M 400-4 is a serious line item. But for OEMs producing turbine blades, structural brackets, heat exchangers, or large medical implants, the cost per part drops significantly versus running multiple M 290 systems. The machine footprint of 4,181 x 1,613 x 2,355 mm requires dedicated floor space and facility infrastructure including inert gas management, powder handling, and post-processing equipment. EOS backs the platform with global service and applications engineering support.

Full Specifications

Parameter	Value
Build Volume	400 x 400 x 400* mm (15.7 x 15.7 x 15.7 in)
Laser Type	Yb-fiber laser; 4 x 400 W
Laser Power	4 x 400 W
Number Of Lasers	4
Scan Speed	up to 7.0 m/s (23.0 ft/s)
Focus Diameter	approx. 90 µm (0.00354 in)
Laser Coverage	4 x 250 x 250 mm quadrants with 50 mm overlap
Optics	4 F-theta lenses, 4 high-speed scanners
Layer Thickness	20 - 100 µm (material dependent)
Technology	Direct Metal Laser Sintering (DMLS)
Materials	Aluminum, Inconel, Steel, Titanium, Tool Steels
Inert Gas	Argon or Nitrogen
Machine Dimensions	5140 x 2490 x 2625 mm (202.4 x 98.0 x 103.3 in)
Software	EOSPRINT, EOSTATE monitoring
CNC Control	EOS proprietary
Presicion Optics	4 F-theta-lens(es); 4 High-speed scanner(s)
Power Supply	3 x 50 A
Power Consumption	max. 45.0 kW / typical 22.0 kW
Compressed Air Supply	7 Bar; 20 m³/h (102 psi; 706 ft³/h)
Recommended Installation Space	min. 7500 x 6000 x 3300 mm (295.3 x 236.2 x 129.9 in)
Machine Weight	approx. 4900 kg (10803 lbs)

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

Strengths & Limitations

Strengths

Four independent 400 W lasers deliver up to 4x throughput versus the single-laser M 290 on large cross-section parts
400 x 400 x 400 mm build volume is 2.56x larger than the M 290, enabling full-size aerospace and energy components
EOS overlap stitching algorithms ensure seamless material properties across laser quadrant boundaries
EOSTATE real-time process monitoring meets aerospace traceability requirements for flight-critical hardware
Same qualified material ecosystem as the M 290, leveraging EOS's industry-leading alloy library
Proven production platform with installations at major aerospace OEMs and Tier 1 suppliers
Global EOS service network with dedicated applications engineering support for production ramp-up

Limitations

Estimated $1.5M-$2.5M price makes it one of the most expensive mid-large format metal AM systems
4,181 mm machine length requires significant dedicated floor space plus peripheral equipment
Four-laser overlap zones require careful parameter tuning to ensure consistent microstructure
Powder consumption and inert gas costs scale with the larger build volume, increasing per-build operating expenses
Build preparation complexity increases with four lasers requiring optimized scan strategies

Best For

Aerospace OEMs producing flight-critical structural components, turbine blades, and heat exchangers in titanium and Inconel Energy sector manufacturers building large combustion and turbine components Serial production facilities replacing multiple single-laser systems with one high-throughput platform Medical device manufacturers producing large orthopedic implants in titanium alloys Automotive and motorsport applications requiring rapid iteration of complex aluminum components

Frequently Asked Questions

01 How much faster is the EOS M 400-4 than the M 290?

With four lasers working simultaneously, the M 400-4 can achieve up to 4x the build rate of the single-laser M 290 on parts with large cross-sections. Real-world gains depend on part geometry - parts with small cross-sections may not fully utilize all four lasers simultaneously. For large aerospace brackets or heat exchangers, 3-4x throughput improvement is realistic.

02 What does an EOS M 400-4 cost?

The M 400-4 typically runs $1.5M-$2.5M depending on configuration and options. Factor in facility preparation, inert gas infrastructure, powder handling systems, and post-processing equipment for total installation costs. Annual service contracts add additional ongoing costs. The economics favor high-utilization production environments where the per-part cost advantage over multiple smaller systems justifies the capital.

03 Can the EOS M 400-4 use the same materials as the M 290?

Yes, the M 400-4 supports the EOS metal material portfolio including AlSi10Mg, Ti6Al4V, Inconel 718/625, various stainless and tool steels. Material parameters are qualified specifically for the four-laser configuration to account for overlap zone stitching. Not every M 290 material may be available on the M 400-4 simultaneously - check with EOS for current availability.

04 How does the overlap between lasers work?

Each laser covers a 250 x 250 mm quadrant of the 400 x 400 mm build plate, with 50 mm overlap zones between adjacent quadrants. EOS's proprietary stitching algorithms manage laser handoff in these overlap regions to maintain consistent material density and microstructure. The result is seamless mechanical properties across the full build volume, verified through extensive qualification testing.