M 400-4 by EOS: status and timeline

M 400-4

A four-laser powder bed fusion system with a 400×400×400 mm build envelope, designed for high-precision serial production of aerospace and automotive metal parts. Each laser operates at 400 W.

DeployStage 4 of 5

In production. The M4 ONYX series is replacing the M 400 line starting Q1 2026.

Checked 10 Oct0 updates this week

Milestones

No announced next step

Over 1,000 laser sintering systems deployed globally2011Complete.
M 400-4 introduced at IMTS ChicagoSep 2016Complete.

Current obstacles

Thermal stressRapid melting and cooling creates residual stress in parts, requiring post-processing heat treatment.
Part cost versus machiningProduction speed and material waste must improve to compete with traditional subtractive manufacturing on large orders.

Physics limits

Laser power limitsEach laser adds complexity and cost. Four lasers create four separate melt pools that must be coordinated to avoid gaps or warping.
Build envelope sizeLarger parts require either multiple pieces or larger machines with more power and cooling. Thermal management scales poorly.

How it works

3 parts

Powder Bed

Layer-by-layer fusion

Metal powder spreads across the platform. Four lasers fuse it, platform drops, new layer applies.

Lasers

Precision heat source

Each 400 W fiber laser creates a focused beam roughly 100 micrometers wide, hot enough to melt the powder without affecting the surrounding material.

Materials

Wide alloy support

Works with aluminum, titanium, stainless steel and super-alloys, making parts for jet engines, landing gear and prosthetics.

Spec sheet

Spec	M 400-4
Build volume	400 × 400 × 400 mm^R (reported)
Laser count	4 × 400 W^R (reported)
Build rate	100 cm³/h^R (reported)
Max scan speed	7.0 m/s^R (reported)
Focus diameter	~100 µm^R (reported)

^R reported by the company

About EOS

The team behind M 400-4

EOS

Metal DMLS LPBF laser sintering manufacturing

EOS manufactures industrial 3D printers for metal and polymer additive manufacturing using DMLS and LPBF. Founded in 1989 in Germany, it serves aerospace, automotive, medical and manufacturing sectors.

EOS is a pioneer in industrial 3D printing, with over 1,000 laser sintering systems installed globally.
In April 2026, EOS acquired Metalpine GmbH, an Austrian supplier of metal powders for additive manufacturing.
The M4 ONYX, launching in Q1 2026, achieves 50% higher throughput and 30% lower part costs than prior systems with six 400 W lasers.

eos.info (opens eos.info)Company profile →

Founded: 198937 yrs
Headquarters: Germany
Status: Private
Valuation: private
Staff: ~1,900
Works in: ManufacturingMetal 3D printing
Coverage: 2 programs · 3 updateslatest 1 Apr 2026checked 10 Oct

Spec

M 400-4

Build volume

400 × 400 × 400 mm^R (reported)

Laser count

4 × 400 W^R (reported)

Build rate

100 cm³/h^R (reported)

Max scan speed

7.0 m/s^R (reported)

Focus diameter

~100 µm^R (reported)