FAQ - LMF “Laser Metal Fusion” technology. Professional 3D printers with selective metal powder bed fusion laser.

During the printing process, is the material completely melted? Is any porosity present inside or on the surface?


The metal components printed with LMF (Laser Metal Fusion) technology generally have a rough surface but very high (close to 100%) densities, as the material is completely melted, not sintered.




What comes after the printing process?


The products manufactured with metal LMF technologies may be subjected to thermal treatment to relax any residual tension resulting from the process itself and to increase the mechanical properties (according to the material, various types of curing are possible, which may affect hardness, traction resistance and ductility).

The need to reduce surface roughness or satisfy very tight dimensional tolerance requires the use of different finishing technologies and surface re-finishing on the manufactured products. According to the material used, various kinds of machining technology (turning, milling), electrical discharge machining, polishing or electropolishing and surface coatings (PVD) may be used.




Can highly air-reactive materials be printed? What are the possible risks?


All materials are reactive to specific reagents, in various ways. That's why the process inside the work chamber occurs always in the presence of an inert gas and the oxygen concentration is very low (under .3%).

In the event of highly reactive materials like aluminum and titanium alloys, the machines are fitted with oxygen level sensors that enable it to be reduced to under 100 parts per million (100ppm).

The risks related to the management of reactive materials are eliminated during the work process. To eliminate all hazards during equipment setups, the machines identified with the RM (reactive materials) mark have an opening with gloves that allow powder handling always in inert atmosphere, avoiding all contact between materials and the external environment.




Can precious and/or reflecting metals be printed? How can I minimize the use of these materials?


Precious metals are particularly reflective at typical infrared laser wavelengths of 1047 nm. Some MYSYNT100 machine setups, identified with the PM (precious metal) marking, use a laser spot with a reduced 30 µm diameter to increase the energy density at the same laser power.

These machines are also distinguished by a kit of interchangeable cylinders to change the work field from Ø100 mm to 63.5 mm and 34 mm




Can I use new alloys or standard alloys from other suppliers?


The process parameters can be changed in all MYSINT series equipment, thus allowing the use of powders from suppliers other than Sisma as well. Additionally, the open parameters facilitate R&D activities aimed at characterizing new materials and applications.




How important are cleanness and maintenance inside the work chamber?


Room chamber cleanness during the manufacturing process is important to ensure quality and repeatability.

A laminar protective gas flow parallel to the countertop enables the removal of oxides and fumes resulting from the process. Gas is extracted, filtered and reintroduced in the work chamber.

The flow is designed to minimize recirculation within the chamber that may contaminate the protective glass and affect the success of the process.




How long will it take me to change material in the machine?


The change of material in machines with a cylinder system is very fast; a trained operator can perform a full change of material on MYSINT100 in less than one hour and on MYSINT300 in about 2-3 hours.




Can powder be reused? What tools will I need?


In the MYSINT100, unmelted powder can be removed around the piece to take the component directly in the machine, moving all the powder to be sifted to the recovery cylinder and using external laboratory equipment to sift the powders.

EVEMET 200 allows the removal of powder not melted during the process in the work chamber. The gloves on the work chamber door allow operators to work in inert atmosphere and the optional extractor fan ensures the complete removal in inert atmosphere of the powder inside the chamber.

MYSINT300 comes with a complete range of peripheral devices that allow any unsolidified powder around the piece to be removed, extracted and sifted in automatic or semiautomatic external work stations, eliminating all contact between operators and powder.




What are the maximum dimensions of the printable piece?


The working area of MYSINT100 machines in the standard, RM, DUAL and DUAL RM measures Ø100x1000 mm.

The maximum working area of MYSINT100 PM, PMRM and RM PRO versions measures Ø100x80 mm.

EVEMET 200 allows the machining of items measuring up to Ø200 x 200 mm height.

The working area of MYSINT300 measures Ø300x400 mm. The double load cylinder allows the use of the entire construction volume without stopping during the process to load new powder.




What's the size of the smallest printable item?


The smallest printable item depends on a combination of machine and material:

  • MYSINT100 with 30 µm beam spot (PM, PMRM) allows the manufacturing of pieces sized under 0.1mm
  • MYSINT100 and EVEMET200 with 55 µm beam spot allow the manufacturing of items as small as 0.15 mm
  • MYSINT300 features a 100 to 500 µm variable beam spot, with a minimal item size of approximately 0.2/0.25 mm





FAQ - DLP “Digital Light Processing” technology. Professional 3D printers using resin polymerization by means of light projection.

During the printing process, is the material completely melted? Is any porosity present inside or on the surface?


The metal components printed with LMF (Laser Metal Fusion) technology generally have a rough surface but very high (close to 100%) densities, as the material is completely melted, not sintered.




What comes after the printing process?


The products manufactured with metal LMF technologies may be subjected to thermal treatment to relax any residual tension resulting from the process itself and to increase the mechanical properties (according to the material, various types of curing are possible, which may affect hardness, traction resistance and ductility).

The need to reduce surface roughness or satisfy very tight dimensional tolerance requires the use of different finishing technologies and surface re-finishing on the manufactured products. According to the material used, various kinds of machining technology (turning, milling), electrical discharge machining, polishing or electropolishing and surface coatings (PVD) may be used.




Can highly air-reactive materials be printed? What are the possible risks?


All materials are reactive to specific reagents, in various ways. That's why the process inside the work chamber occurs always in the presence of an inert gas and the oxygen concentration is very low (under .3%).

In the event of highly reactive materials like aluminum and titanium alloys, the machines are fitted with oxygen level sensors that enable it to be reduced to under 100 parts per million (100ppm).

The risks related to the management of reactive materials are eliminated during the work process. To eliminate all hazards during equipment setups, the machines identified with the RM (reactive materials) mark have an opening with gloves that allow powder handling always in inert atmosphere, avoiding all contact between materials and the external environment.




Can precious and/or reflecting metals be printed? How can I minimize the use of these materials?


Precious metals are particularly reflective at typical infrared laser wavelengths of 1047 nm. Some MYSYNT100 machine setups, identified with the PM (precious metal) marking, use a laser spot with a reduced 30 µm diameter to increase the energy density at the same laser power.

These machines are also distinguished by a kit of interchangeable cylinders to change the work field from Ø100 mm to 63.5 mm and 34 mm




Can I use new alloys or standard alloys from other suppliers?


The process parameters can be changed in all MYSINT series equipment, thus allowing the use of powders from suppliers other than Sisma as well. Additionally, the open parameters facilitate R&D activities aimed at characterizing new materials and applications.




How important are cleanness and maintenance inside the work chamber?


Room chamber cleanness during the manufacturing process is important to ensure quality and repeatability.

A laminar protective gas flow parallel to the countertop enables the removal of oxides and fumes resulting from the process. Gas is extracted, filtered and reintroduced in the work chamber.

The flow is designed to minimize recirculation within the chamber that may contaminate the protective glass and affect the success of the process.




How long will it take me to change material in the machine?


The change of material in machines with a cylinder system is very fast; a trained operator can perform a full change of material on MYSINT100 in less than one hour and on MYSINT300 in about 2-3 hours.




Can powder be reused? What tools will I need?


In the MYSINT100, unmelted powder can be removed around the piece to take the component directly in the machine, moving all the powder to be sifted to the recovery cylinder and using external laboratory equipment to sift the powders.

EVEMET 200 allows the removal of powder not melted during the process in the work chamber. The gloves on the work chamber door allow operators to work in inert atmosphere and the optional extractor fan ensures the complete removal in inert atmosphere of the powder inside the chamber.

MYSINT300 comes with a complete range of peripheral devices that allow any unsolidified powder around the piece to be removed, extracted and sifted in automatic or semiautomatic external work stations, eliminating all contact between operators and powder.




What are the maximum dimensions of the printable piece?


The working area of MYSINT100 machines in the standard, RM, DUAL and DUAL RM measures Ø100x1000 mm.

The maximum working area of MYSINT100 PM, PMRM and RM PRO versions measures Ø100x80 mm.

EVEMET 200 allows the machining of items measuring up to Ø200 x 200 mm height.

The working area of MYSINT300 measures Ø300x400 mm. The double load cylinder allows the use of the entire construction volume without stopping during the process to load new powder.




What's the size of the smallest printable item?


The smallest printable item depends on a combination of machine and material:

  • MYSINT100 with 30 µm beam spot (PM, PMRM) allows the manufacturing of pieces sized under 0.1mm
  • MYSINT100 and EVEMET200 with 55 µm beam spot allow the manufacturing of items as small as 0.15 mm
  • MYSINT300 features a 100 to 500 µm variable beam spot, with a minimal item size of approximately 0.2/0.25 mm





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