FS421M

The FS421M is a DMLS 3D printer from Farsoon Technologies with a 425 x 425 x 420 mm build volume.

Specifications

Farsoon FS421M: Technical Specifications

Laser System

The FS421M uses one or two 500 W fiber lasers (1060–1080 nm). The dual-laser configuration splits the build field for parallel sintering, reducing build time by up to 40% for fully packed jobs. Minimum focused beam diameter is approximately 80 µm.

Scanner and Optics

Galvanometer scanner with maximum scan speed 15.2 m/s; F-theta optics maintain a constant spot size across the full XY field. Accuracy: ±0.1 mm for features under 100 mm; ±0.1% of dimension for longer spans.

Platform and Z-Drive

425×425 mm metal build platform with 420 mm vertical travel via precision ball-screw.

Calibration

Calibration of the Farsoon FS421M

Laser and Optics Calibration

After any laser module swap or transport, perform a full XY calibration using the Farsoon-certified calibration plate. Verify spot diameter, focal distance, and dual-laser parallelism.

Platform Levelling

Mechanical levelling with a feeler gauge: parallelism <50 µm across the full field. Critical for Ti6Al4V where first-layer delamination is the primary risk.

Inert Atmosphere.

Common defects

Typical Defects on the Farsoon FS421M

Gas Porosity

Cause: incorrect VED (Volume Energy Density) or trapped inert gas. Fix: optimise P/(v×h×t) for the specific alloy; check powder quality and ensure O₂ <100 ppm.

Solidification Cracking

Cause: high thermal gradient in nickel superalloys and chrome-molybdenum steels without adequate platform heating. Fix: Island/Chessboard scan strategy; gradual post-build cool-down.

Residual Stress Distortion.

What it is used for

Applications of the Farsoon FS421M

Aerospace Structural Components

The 425×425×420 mm volume accommodates single-build turbine housings, load-bearing brackets, and ducts without part splitting. Compatible with IN718, IN625, Ti6Al4V, and Haynes 230.

24/7 Serial Production with CAMS

Automatic depowdering, sieving, and powder feeding enable continuous production shifts.