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The FS421M additive metal melting system is a true manufacturing systems capable continuous production. With its 425x425x420mm build cylinder, the FS421M is capable of producing large metal parts from a wide range of metal powder materials. The large build cylinder combined with a multi-laser and fully digital optics system enable enhanced production speed while the internal rail system enables the fast exchange of cylinders between builds.

The FS421M comes equipped with an all new advanced industrial powder handling system. Powder supply, building, breakout, and sieving are operated under inert atmosphere. The FS421M's powerful and highly efficient air filtration systems allows for the processing of reactive materials while it's high capacity and auto-cleaning capability allows for extended use between filter changes.

The FS421M like all Farsoon systems allows for complete freedom of operation by its users. This means that all machine parameters are unlocked for the user as well as an open material policy allowing for previously-impossible levels of freedom and flexibility when it comes to additive metal melting production. In addition, the in house Farsoon software allows for ease of use with both an advanced user interface as well as a touch screen based production interface for everyday use.







External Dimensions (LxWxH)

2700 × 1290 × 2290 mm

Build Cylinder Size1 (LxWxH)

425 × 425 × 420 mm (not including build plate thickness)

Net Weight

Approx. 3450KG (Single laser) / 3500KG (Dual laser)

Layer Thickness

0.02 - 0.1 mm

Scanning Speed

Max. 15.2 m/s

Laser Type

Dual fiber laser, 2 × 500W or Single fiber laser, 1 × 500W


High-precision three-axis digital galvo system

Laser Spot Size

Approx. 70 μm contour, 70-200 μm fill

Average Inert Gas Consumption in Process

<3 L/min. (Argon/Nitrogen)

Operating System

64 bit Windows 10

Comprehensive Software

BuildStar, MakeStar®

Key Software Features

Open machine key parameters, real-time build parameter modification, three-dimensional visualization, diagnostic functions

Data File Format


Power  Supply

EUR/China: 380-400V, 50/60Hz, three-phase. US: transformer sold with machine

Operating Ambient Temperature



316L, HX, HAYNES 230*, IN718, IN625, AlSi10Mg, AlMgScZr, TA15, Ti6Al4V, CuSn10, more materials to come

1 The functional build volume depends on the parts/materials.

2 The materials marked with * are in the build process development.


Many factors may affect the performance characteristics of products. We recommend that you make tests to determine the suitability of a product for your particular purpose prior to use. Farsoon makes no warranties of any type, express or implied, including but not limited to, the warranties of merchantability or fitness for a particular use. This also applies regarding the consideration of possible intellectual property rights as well as laws and regulations. Farsoon reserves the right to change the technical data without notice. Farsoon®, Buildstar®, Makestar® are registered trademarks of Farsoon Technologies. Last Change: 2021-08-10


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