EOS M 300-4 Metal Additive Manufacturing System
Key Specifications
Build Volume
Laser System
Layer Thickness
Positioning Accuracy
Beam Diameter
Build Rate
Overview
The EOS M 300-4 is a quad-laser powder bed fusion (PBF) metal additive manufacturing system from EOS GmbH, the German company widely credited with pioneering industrial laser sintering for both polymer and metal applications. The M 300-4 uses four 400W fiber lasers that operate simultaneously across a 300x300 mm build platform, dramatically increasing throughput compared to single-laser systems. The machine targets aerospace, medical implant, tooling, and defense applications requiring complex internal geometries, lattice structures, and consolidated part designs that cannot be produced by subtractive machining. EOS's DMLS (Direct Metal Laser Sintering) process fuses metal powder layer by layer, with support structures printed simultaneously for overhanging features. The M 300-4 processes a wide range of metal alloys including EOS Titanium Ti64, Inconel 625/718, Aluminum AlSi10Mg, Maraging Steel MS1, and Cobalt Chrome MP1. EOSprint 2 software manages the full workflow from STL import through laser parameter selection, support generation, and build simulation. The M 300-4 is a production-capable system certified for use in medical device and aerospace supply chains under ASTM F3049 guidelines.
Full Specifications
| Parameter | Value |
|---|---|
| Build Volume | 300x300x400 mm (11.8x11.8x15.7 in) |
| Laser System | 4 x 400W fiber laser |
| Layer Thickness | 0.02 – 0.08 mm (material dependent) |
| Positioning Accuracy | ±0.05 mm |
| Beam Diameter | 100 micron at focus |
| Build Rate | Up to 100 cm3/h (multi-laser, material dependent) |
| Materials | Ti64, Inconel 625/718, AlSi10Mg, MS1 steel, CobaltChrome |
| Atmosphere | Inert argon atmosphere (< 0.1% O2) |
| Software | EOSprint 2 |
| Certification | ISO 13485 (medical), AS9100 (aerospace) production ready |
| Build Volume | 300 x 300 x 435* mm (11.8 x 11.8 x 17.1 in) |
| Laser Type | Yb-fiber laser; 4 x 400 W |
| Presicion Optics | 4 F-theta-lens(es); 4 High-speed scanner(s) |
| Scan Speed | up to 7.0 m/s (23.0 ft/s) |
| Focus Diameter | approx. 100 µm (0.00394 in) |
| Power Supply | 3 x 63 A |
| Power Consumption | max. 19.6 kW / typical 16.0 kW |
| Compressed Air Supply | 7 Bar; 15 m³/h (102 psi; 530 ft³/h) |
| Machine Dimensions | 5221 x 2680 x 2340 mm (205.6 x 105.5 x 92.1 in) |
| Recommended Installation Space | min. 8800 x 5200 x 3500 mm (346.5 x 204.7 x 137.8 in) |
| Machine Weight | approx. 5500 kg (12125 lbs) |
Specifications sourced from eos.info — verified 2026-03-28
Strengths & Limitations
Strengths
- Quad-laser system provides 4x throughput vs single-laser machines of same build volume
- 300x300x400 mm build volume accommodates mid-size aerospace and medical components
- EOS is the market reference for certification in medical device and aerospace DMLS supply chains
- EOSprint 2 software provides build simulation for distortion and support optimization
- Processes the widest certified material portfolio in the DMLS industry
Limitations
- Very high capital and operating cost — metal powder, post-processing, and maintenance are expensive
- 300x300 mm build platform limits to smaller parts — larger components require 400M or 500 series
- Post-processing (support removal, HIP, heat treatment, machining) adds significant time and cost
- Powder handling and inert atmosphere safety requirements add facility demands
Best For
Frequently Asked Questions
01
DMLS (Direct Metal Laser Sintering) is EOS's branded name for their laser powder bed fusion process. SLM (Selective Laser Melting) is the generic term. Both melt metal powder with a laser — the distinction is primarily marketing. EOS's DMLS fully melts the powder rather than sintering (partial melting), resulting in near-100% dense parts.
02
The machine itself is AS9100-ready, but aerospace part qualification requires establishing a validated process specification, lot traceability, material certification, and typically non-destructive testing for each part type. The machine is a component of an AS9100 quality system, not a standalone certification.
03
Standard post-processing includes: stress relief heat treatment (in the build chamber or external furnace), part removal from the build plate, support structure removal (machining or manual), surface finishing (machining, polishing, or electropolishing), and dimensional inspection. For implants, additional hot isostatic pressing (HIP) may be required.
Videos
EOS 3D Printing
EOS 3D Printing
EOS 3D Printing
EOS 3D Printing
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