EOS M 300-4

The EOS M 300-4 is an SLM 3D printer from EOS with a 300 x 300 x 400 mm build volume.

Specifications

EOS M 300-4: Technical Overview

Technology and Lasers

The EOS M 300-4 uses DMLS (Direct Metal Laser Sintering) with four simultaneous 400 W ytterbium fiber lasers. Each laser covers a 150 × 150 mm zone with 50 mm overlap between adjacent zones: totaling 300 × 300 mm coverage.

Optics and Scanner

Four independent galvanometer systems with F-Theta lenses; scanning speed up to 7 m/s per laser. Focus diameter ~100 µm. Overlap zones require specialized alignment calibration.

Build Volume

300 × 300 × 400 mm: 44% larger than the M 290 by volume; maximum theoretical volume ~36 liters.

Chamber and Environment.

Calibration

Calibration of the EOS M 300-4

• Multi-laser alignment: in EOSPRINT 2, run the calibration procedure for all four lasers individually, then verify overlaps. Target: < 0.05 mm per laser, < 0.03 mm in overlap zones. Frequency: ~250 hours (shorter than M 290 due to overlap criticality).
• Recoater inspection: inspect blades visually and via a test layer before every build; stripe artifacts indicate wear → replace. The larger platform amplifies the effect of even minor wear.

3.

Common defects

Common Defects on the EOS M 300-4

Laser seam lines: visible seams at the boundary between laser zones. A multi-laser-specific defect, rarely encountered on the M 290. Cause: imperfect positional or parameter alignment in the 50 mm overlaps. Fix: strict multi-laser alignment calibration; dedicated overlap parameters; mandatory test coupons.

High-throughput porosity: with aggressive speed parameters for maximum output, energy density may drop below the full-melt threshold.

What it is used for

Applications of the EOS M 300-4

Aerospace serial production: the M 300-4 is deployed at leading aerospace OEMs and suppliers for serial production of structural parts, fuel system components, and engine hardware. The Shared Modules concept enables continuous 24/7 production cycles.