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Detailed Explanation of UV 3D Printing Technology Types (Part 2)

Release time:

2026-07-21 16:50

Detailed Explanation of UV 3D Printing Technology Types (Part 2)

DLP (Digital Light Processing) is a photopolymerization-based 3D printing technology that evolved after SLA. This technique uses a digital projector to simultaneously project an entire layer’s image onto the resin surface, enabling synchronous curing of the whole layer. Unlike SLA’s point-by-point scanning, DLP’s area‑based curing approach significantly boosts printing speed, offering clear advantages in high‑volume production applications such as dentistry and jewelry.

I. Technical Principle

The core of DLP technology lies in the digital micromirror device (DMD chip) and the projection-based curing process.

1. Light Source and Imaging System: DLP devices use either UV LEDs or mercury lamps as their light source. The light is homogenized by a lens system before being projected onto the surface of the DMD chip. The DMD chip consists of numerous tiny, independently controllable mirrors, with each micro‑mirror corresponding to a single pixel. By adjusting the tilt angle of these micro‑mirrors, the system determines whether light is directed onto the resin surface.

2. Full-layer synchronous curing: During the printing process, the DMD chip uses the cross-sectional image data of the current layer to control the micro-mirrors corresponding to each pixel, reflecting ultraviolet light onto the resin surface. This enables the entire layer of resin to cure simultaneously, with a relatively short exposure time per layer.

3. Layer-by-layer stacking: After each layer has been cured, the print platform rises by one layer thickness, and the next layer is projected and cured until the model is complete.

II. Technical Features

1. Printing Speed: The core advantage of DLP lies in its speed. Because the entire layer cures simultaneously and each layer requires a short exposure time, DLP printing is significantly faster than SLA, making it well-suited for mass-producing small parts.

2. Precision Performance: DLP’s precision is limited by the pixel size of the DMD chip, and it degrades as the print format increases. This is because, at a given resolution, a larger‑area chip coverage results in a larger physical size per pixel.

3. Equipment Cost: DLP equipment prices fall between those of SLA and LCD systems, with the DMD chip serving as a core high-value component whose repair and replacement costs are relatively high.

4. Light Source Lifespan: LED light source modules have a longer lifespan, whereas mercury lamps require periodic replacement.

III. Applicable Scenarios

The combination of DLP technology’s high speed and high precision gives it an advantage in the following fields:

1. Mass production in dentistry: Batch printing of dental models, crowns, surgical guides, and other products to meet the rapid production needs of dental clinics and laboratories.

2. Jewelry wax patterns: Mass‑produce wax patterns for jewelry casting to enhance production efficiency.

3. Cultural and creative products: rapid prototyping of small-batch items such as anime figurines, miniature models, and relief crafts.

4. Industrial Components: Requires rapid prototyping for product validation and small-batch production of functional components.

IV. Limitations

DLP technology faces the following limitations in practical applications: print accuracy degrades significantly at large build sizes, and the printable area is constrained by the projector’s resolution and light‑uniformity; DMD chip repair costs are relatively high; the transparent window at the bottom of the resin tank is a consumable that requires periodic replacement; and the uniformity of projected light affects the consistency of layer‑wise curing.

V. Conclusion

DLP technology achieves a significant boost in printing speed through full‑layer projection curing, delivering a clear efficiency advantage in high‑volume production settings such as dentistry and jewelry. Although its resolution is constrained by pixel size, it already meets the requirements of most professional applications. For scenarios demanding rapid, large‑batch printing, DLP is a highly suitable technological choice.

Disclaimer: The above content has been compiled from publicly available sources and is provided for reference only. If any infringement occurs, please contact us, and we will address it promptly.

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Detailed Explanation of UV 3D Printing Technology Types (Part 3)

Detailed Overview of UV 3D Printing Technology Types (Part 1)