EOS P 770

The EOS P 770 is an SLS 3D printer from EOS with a 700 x 380 x 580 mm build volume.

Specifications

EOS P 770: Technical Specifications

Build Volume and Laser System

The EOS P 770 offers a build volume of 700 × 380 × 580 mm (~150 litres): the largest in EOS's polymer SLS range. Two 70 W CO₂ laser heads cover the area via galvanometric scanners, achieving build rates up to 5.6 litres/hour at 120 µm layer thickness. Minimum layer thickness is 60 µm; maximum is 180 µm.

Scanner and Optics

The two galvanometric scanners operate simultaneously, each covering half the build area; the boundary between their zones requires precise joint calibration.

Heating and Environment

Active sealed chamber with zonal temperature control, maintained around 172 °C for PA 12.

Calibration

Calibration Procedures

• Powder Bed Leveling: Before each build series, verify the levelness of the build platform using EOSPRINT's built-in diagnostic. Target deviation: < 0.1 mm across the 700 mm axis. Tip: Do not skip the two far corners of the long axis.
• Dual-Laser Joint Calibration: Both galvanometric scanners must be jointly calibrated after any machine relocation or optics replacement. Validate with a test coupon spanning the zone boundary; seam must be < 0.05 mm.

Common defects

Common Defects on SLS (EOS P 770)

Warping: Corners of flat parts or ribs of thin-wall geometry deform after cooling. Cause: uneven chamber temperature or degraded-MFR powder. Fix: reduce the recycled-powder fraction, check zonal heaters, orient thin walls vertically.

Delamination: Visible inter-layer lines, brittleness in bending. Cause: insufficient laser energy density or underpowered chamber heating.

What it is used for

Applications and Limitations

Best suited for:

• Large automotive and aerospace prototypes (full-size bumpers, panels, duct systems): the 700 mm X-axis allows true-scale single-piece parts.
• Dense nesting of small-to-medium batch runs: the 150-litre chamber is ideal for service bureaus requiring hundreds of parts per build.
• Functional tooling and production jigs from PA 12 or Alumide.