In FDM,material (thermoplastic) is deposited in layers to create a 3D Printed object.
During printing, the plastic filament is fed through a hot extruder where the plastic gets
soft enough that it can be precisely placed by the print head.
Stereolithography (often called SLA or SL) rapidly builds components using a precise UV laser to cure and solidify thin layers of a photo-reactive resin.
One of the most accurate 3D printing technologies, SLA printers usually build the models from top to bottom, the build platform lifts the model upwards, out of the resin bath.
(Selective Laser Sintering)
It's a 3D Printing technique that uses high power CO2 lasers to fuse particles together.
SLS produces durable, high precision parts, and it can use a wide range of materials. It's a perfect technology for fully-functional, end-use parts and prototypes.
( Direct Metal Laser Sintering )
Direct Metal Laser Sintering (DMLS) is a direct metal laser melting (DMLM) or laser powder bed fusion (LPBF) technology that accurately forms complex geometries not possible with other metal manufacturing methods.
DMLS parts are stronger and denser than investment casted metal parts, and they can help you get to market first with faster turnaround times.
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