The EOS M 400 is an SLM 3D printer from EOS with a 400 x 400 x 400 mm build volume.
The EOS M 400 is an SLM 3D printer from EOS with a 400 x 400 x 400 mm build volume.
EOS M 400, Technical Specifications
Laser System
Single 1000 W ytterbium fiber laser, the most powerful single laser in the EOS portfolio at launch. High power enables thick-layer operation (up to 200 µm) and high-conductivity materials.
Scanning Optics
F-theta optics with galvo scanner; focus diameter ~90–100 µm. The full 400×400 mm field is covered by the single laser.
Build Platform and Volume
400×400×400 mm: EOS record for a single-laser configuration. Controlled Z-axis; build plate in tool steel or Ti.
Chamber and Shielding Gas
Sealed process chamber with nitrogen/argon recirculation; O₂ monitoring; smoke filtration.
EOS M 400 Calibration
1. Recoater Blade Leveling
Level recoater blade to ≤15 µm across the 400×400 mm build plate; check every 50 build hours.
2. 1000 W Laser Calibration
Verify focus diameter (≤100 µm) and power deviation (≤2%) every 500 hours; request EOS laser service if out of spec. Clean beam expander of powder contamination.
3. Oxygen Control
Purge to O₂ <0.1% for Ti/Al; <0.2% for steel/Inconel. Check door seals and powder feed system for O₂ creep.
4.
Common Defects on EOS M 400
Keyhole Porosity
At 1000 W and thick layers (>120 µm), keyhole mode is easily triggered. Fix: reduce power or speed; use EOS validated parameters.
Warping of Flat Parts
The 400×400 mm plate is prone to warping in Al and low-carbon steel. Fix: island scanning; preheat; strap supports around perimeter.
Recoater Collision
Distortion >200 µm triggers crash and emergency stop. Fix: 67° scan rotation; chequerboard pattern.
Lack-of-Fusion in Inconel.
EOS M 400 Use Cases
Large Aerospace Parts (Single Production)
The 400³ mm field accommodates turbine casings and structural brackets as single parts without split-build.
Large Tooling with Conformal Cooling
Full injection molds in MS1/1.2709 tool steel with conformal channels at 80–120 µm layer thickness.
Research Builds.
| Manufacturer | EOS |
|---|---|
| Technology | SLM |
| Class | industrial |
| Build volume | 400 x 400 x 400 mm |
| Layer height | 40-200 µm |
| Kinematics | gantry |
| Enclosure | active |
| Auto levelling | no |
| Price | 900 000 EUR |
| Compatible materials | alsi10mg, ss-316l, ti-6al-4v, inconel-718, cocr, copper |
| Price (EUR) | 900 000 EUR |
|---|---|
| Note | Reference from the database; no market source or date. |
| Manufacturer | EOS |
|---|---|
| Technology | SLM |
| Class | industrial |
| Build volume | 400 x 400 x 400 mm |
| Layer height | 40-200 µm |
| Kinematics | gantry |
| Auto levelling | no |
same class and kinematics, close in price within 30 percent
| Model | Class | Kinematics | Build volume | Price (EUR) |
|---|---|---|---|---|
| EOS M 400 (this) | industrial | gantry | 400 x 400 x 400 mm | 900000 |
| FormUp 350 | industrial | gantry | 350 x 350 x 350 mm | 900000 |
| FS621M | industrial | gantry | 620 x 620 x 1100 mm | 900000 |
| Lasertec 30 SLM 3rd Generation | industrial | gantry | 325 x 325 x 400 mm | 850000 |
| Material |
|---|
| AlSi10Mg |
| Stainless Steel 316L |
| Ti-6Al-4V |
| Inconel 718 |
| CoCr (Cobalt-Chrome) |
| Copper (Cu) |