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Projection micro stereolithography

Projection micro stereolithography (often shortened to “projection micro-SLA”) is a type of additive manufacturing (3D printing) that builds tiny parts layer-by-layer using light to cure a liquid resin. Instead of scanning a laser point-by-point, it projects an entire image of each layer onto the resin at once, which c

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  1. What it means

    Projection micro stereolithography (often shortened to “projection micro-SLA”) is a type of additive manufacturing (3D printing) that builds tiny parts layer-by-layer using light to cure a liquid resin. Instead of scanning a laser point-by-point, it projects an entire image of each layer onto the resin at once, which can improve speed and consistency for micro-scale features.

  2. How it works (high level)

    A digital mask or pattern is projected onto the resin surface. Where the light hits, the resin polymerizes (solidifies). After curing, the build platform moves (or the resin level changes), and the next layer is projected. Because the method is designed for fine detail, it’s commonly used for microfluidics, micro-optics, dental/medical prototypes, and small precision components.

  3. Key considerations

    Performance depends on resin chemistry, light wavelength, projection resolution, layer thickness, and optical alignment. Common challenges include curing depth limits, feature distortion from shrinkage, support/overhang handling, and post-processing needs (washing and additional curing). For best results, manufacturers typically specify minimum feature sizes and recommended exposure parameters.

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FAQ

What’s the difference from laser stereolithography?

Projection micro-SLA cures an entire layer image at once, while laser-based SLA typically cures point-by-point or line-by-line, which can affect speed and resolution characteristics.

Is it used for final products or prototypes?

Both, depending on the resin and required tolerances. Many applications start with prototypes, while some resins support functional end-use parts.

What post-processing is usually required?

Often includes rinsing/washing to remove uncured resin and a secondary UV/thermal cure to improve final mechanical properties and stability.

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