The EOS M4 ONYX is an SLM 3D printer from EOS with a 450 x 450 x 400 mm build volume.
The EOS M4 ONYX is an SLM 3D printer from EOS with a 450 x 450 x 400 mm build volume.
EOS M4 ONYX: Technical Specifications
Laser System
Standard version: six 400 W ytterbium fiber lasers with full-field coverage of the 450×450 mm build area, delivering 50% higher throughput vs. M 400-4.
FLX variant: four 1.5 kW nLIGHT AFX beam-shaping lasers with dynamically variable spot geometry: from fine detail (<0.3 mm walls) to high-speed infill scanning without optics change.
Scanning Optics
Modular multi-scanner architecture; FLX: AFX actuator for dynamic spot geometry. Stitching in overlap zones between scanners calibrated to ≤15 µm.
Build Platform and Volume
450×450×400 mm: the largest field in EOS history.
EOS M4 ONYX Calibration
1. Multi-Scanner Calibration (6 or 4 FLX Lasers)
Each laser block requires individual position and focus calibration; overlap zones verified with stitching test builds (target ≤15 µm). Run full multi-scanner calibration after every service event.
2. Recoater Blade Leveling (450 mm Field)
Wider field requires tolerance ≤10 µm and check every 40 hours; replace blade at visible deformation.
3. Inert Atmosphere and RFS Pro Verification.
Common Defects on EOS M4 ONYX
Stitching Mismatch
Visible lines in overlap zones between lasers due to uncalibrated inter-scanner geometry or thermal expansion. Fix: multi-scanner calibration; thermal-compensation in EOSPRINT.
Porosity at Mode Transition (FLX)
VED jump when switching fine/speed modes. Fix: transition buffer pass; EOS validated transition parameters.
Recoater Streaks on 450 mm Field
Longer blade is more vulnerable.
EOS M4 ONYX Use Cases
Serial Aerospace Production
50% higher throughput + 30% lower part cost vs. M 400-4: direct benefit for serial Ti and Inconel aerospace components.
Turbine Superalloy Components
Six lasers covering the full 450×450 mm field in parallel: significantly accelerates Inconel 718 and CM247LC jobs.
Fine Detail + High-Speed Infill (FLX).
| Manufacturer | EOS |
|---|---|
| Technology | SLM |
| Class | industrial |
| Build volume | 450 x 450 x 400 mm |
| Layer height | 20-100 µm |
| Kinematics | gantry |
| Enclosure | active |
| Auto levelling | no |
| Price | 2 000 000 EUR |
| Compatible materials | alsi10mg, ss-316l, ti-6al-4v, inconel-718, cocr, copper |
| Price (EUR) | 2 000 000 EUR |
|---|---|
| Note | Reference from the database; no market source or date. |
| Manufacturer | EOS |
|---|---|
| Technology | SLM |
| Class | industrial |
| Build volume | 450 x 450 x 400 mm |
| Layer height | 20-100 µm |
| Kinematics | gantry |
| Auto levelling | no |
same class and kinematics, close in price within 30 percent
| Model | Class | Kinematics | Build volume | Price (EUR) |
|---|---|---|---|---|
| EOS M4 ONYX (this) | industrial | gantry | 450 x 450 x 400 mm | 2000000 |
| MetalFab 420K | industrial | gantry | 420 x 420 x 400 mm | 1500000 |
| Sapphire XC 1MZ | industrial | gantry | 600 x 600 x 1000 mm | 1400000 |
| M Line | industrial | gantry | 500 x 500 x 400 mm | 1300000 |
| Material |
|---|
| AlSi10Mg |
| Stainless Steel 316L |
| Ti-6Al-4V |
| Inconel 718 |
| CoCr (Cobalt-Chrome) |
| Copper (Cu) |