FS121M

The FS121M is a DMLS 3D printer from Farsoon Technologies with a 120 x 120 x 100 mm build volume.

Specifications

Laser: 200 W Yb-fiber laser with 40 µm standard spot size at the build platform.

Scanner: Galvanometric scan system; scan speed up to 15,200 mm/s.

Platform: 120×120×100 mm build volume with optional pre-heated build plate.

Shielding Gas: Argon or nitrogen; nitrogen is sufficient for CoCr and steels, argon recommended for Ti and Cu alloys.

Build Volume: 120×120×100 mm: optimised for dental framework arrays and small industrial parts.

Layer Thickness: 20-100 µm; 20-30 µm recommended for dental accuracy.

Software: Farsoon MakeStar (native); Materialise Magics with Farsoon Build Processor (option).

Calibration

Laser verification: Power meter + burn-paper test; 200 W ±5%, spot 38-42 µm.

VED optimisation: 50-70 J/mm³ for CoCrMoW at 20-40 µm layers; validate with Archimedes density test.

Atmosphere: O₂ <100 ppm (steel/CoCr), <50 ppm (Ti): nitrogen is a cost-effective option for non-noble alloys.

Powder recoating: Visual check for dense dental arrays; recycled powder fraction maximum 70%.

Stress relief: Mandatory 800°C/2h for CoCrMoW before removal from build platform.

Common defects

Porosity: Suboptimal VED: adjust to 55-65 J/mm³ for CoCrMoW.

Cracking on removal: Skipped stress relief: mandatory thermal cycle before EDM wire cutting.

Rough surface >5 µm Ra: Thick layer or missing contour pass: reduce layer to 20-30 µm, add contour scan.

Balling in CuSn10: O₂ too high under nitrogen: switch to argon <30 ppm.

What it is used for

Dental: 40 µm spot and 20 µm layer for CoCr crowns with Ra<3 µm before polishing.

Small aerospace parts: Open platform for Ti-6Al-4V qualification without vendor restrictions.

Material R&D: Full open-parameter access for researchers developing new LPBF powders.

Jewellery: 20 µm layer and compact volume for precise Au/Pt articles.