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Selective Laser Sintering (SLS) or Laser Sintering (LS), uses a laser to manufacture prototypes by sintering (fusing) powdered material layer by layer from the bottom up. There is reduced strength between the fused particles, so the parts will tend to be weaker than machined or moulded parts made from the same resin. The material used will usually be Nylon based. SLS parts can be accurate and more durable than SLA parts, but the finish is relatively poor, with a grainy or sandy feel. This can, however, be sanded and paint effects can be applied to improve the cosmetic appearance.
"Stereolithographic Apparatus”(SLA) is an additive manufacturing process using a vat of liquid resin and a UV laser to build prototypes a layer at a time.The laser is used to trace out and cure a cross-section of the part design on the surface of the liquid resin and the process is repeated. Each newly cured layer adheres to the layer below it. SLA was the first ‘rapid prototyping’ technology. These parts can, however,be brittle and weak, so they have to be carefully handled.
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