FS621M

The FS621M is an SLM 3D printer from Farsoon Technologies with a 620 x 620 x 1100 mm build volume.

Specifications

Farsoon FS621M: Technical Specifications

Laser Engine: Single 1000 W or quad 4×500 W fiber lasers (Yb-fiber, ~1070 nm wavelength).

Scanner: Galvo-scanner system with adjustable spot diameter for resolution vs. throughput balance.

Platform: 620×620 mm build platform with 1100 mm Z-travel: one of the deepest Z-strokes in the SLM segment. Heated build platform for thermal stress reduction.

Chamber & Inert Gas: Sealed chamber with argon atmosphere; target O₂ < 500 ppm for reactive metals; recirculating gas with HEPA filtration.

Build Volume: 620×620×1100 mm (~0.42 m³): enables single-piece components over 1 meter tall without welding.

Calibration

Calibration Protocol: Farsoon FS621M

1. Laser Calibration & Focus Verification: Each laser calibrated individually via test burns on a calibration plate. In quad configuration, sequential calibration avoids cross-laser interference. Target spot within ±5 µm of specification.

2. Build Platform Leveling: Dial indicator check at four corners; allowable deviation < 50 µm across the 620 mm span. Re-check after any powder transport or conveyor servicing.

3.

Common defects

Typical Defects, Farsoon FS621M

Porosity (Gas / Keyhole): Cause, suboptimal energy density, moisture in powder, miscalibrated focus. Fix: optimize VED, dry powder (< 0.1% moisture), recalibrate focus.

Cracking & Delamination: Common in IN718 and low-ductility alloys under rapid cooling. Fix: heat build platform, optimize supports for heat dissipation, reduce scan speed.

Spattering & Powder Contamination: Excessive power or uneven gas flow in the large chamber.

What it is used for

Use Cases: Farsoon FS621M

Large-format Aerospace Structural Components: The 1100 mm Z-axis is unique in the market: enables production of aircraft load-bearing structures, engine housings, and rocket components as single pieces without welding. Qualified Ti-6Al-4V and IN718 parameters available.