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Light-Curing 3D Printers: Technical Principles and Selection of SLA, DLP, and LCD Technologies
Release time:
2025-01-10 17:01
In recent years, 3D printing has become extremely popular. Based on their printing principles and materials, 3D printers can be categorized into different types. As a manufacturer of photopolymer resins, Bosheng New Materials would like to focus today on 3D printers that utilize photopolymer resins. There are three common types of photopolymer-based 3D printers: SLA, DLP, and LCD. Let’s take a closer look at the working principles and technical comparisons among these three types of photopolymer 3D printers.
The Chinese name for SLA is Light-Curing Additive Manufacturing or Stereolithography. It is the earliest 3D printing technology to be commercialized. The basic principle of SLA forming lies in using a laser as the light source; after being focused by a lens, the laser beam scans the cross-sectional profile along the liquid surface according to the device’s instructions. In the scanned area, the photosensitive resin rapidly solidifies. Then, the worktable descends by one layer’s thickness, and another cross-section is cured. This process is repeated layer by layer, gradually building up a three-dimensional object.
DLP’s Chinese name is Digital Light Processing Rapid Prototyping Technology. The fundamental principle behind its forming process is that the 3D model is sliced horizontally into layers by 3D printing software. A projector then projects the shape of the first layer onto the resin tank, where it undergoes photopolymerization and solidifies. After the first layer is formed, the build platform is slightly raised, and the projector casts the shape of the next layer onto the resin tank. This process is repeated iteratively, layer by layer, to build up the final model. Unlike SLA’s single-point exposure, DLP uses area exposure, which significantly boosts printing speed. Moreover, in terms of precision and surface quality, DLP 3D printers generally outperform SLA 3D printers.
The Chinese term for LCD is "liquid crystal display forming technology." It is similar to DLP printing technology, but instead of using a projector to generate images, it leverages the imaging principle of liquid crystal displays (LCDs). On the LCD screen, selective transparent areas are created. Ultraviolet light passes through these transparent areas and irradiates the photosensitive resin material in the resin tank, causing it to cure and solidify. Once the curing time for each layer is complete, the platform lift raises the cured portion, allowing the photosensitive resin to flow back and refill the gap. The platform then descends again, and the thin layer between the model and the release film is exposed once more to ultraviolet light. In this way, the model is gradually built up layer by layer, ultimately producing a beautifully detailed three-dimensional object.
The three types of light-curing 3D printers each have their own unique characteristics. So how do you choose the right printer for yourself? If you need to print large-scale models or engage in mass production, SLA is the best choice; if you prioritize printing speed and precision, DLP is an excellent option; and if you’re focused on cost-effectiveness, LCD is a great choice.
As a manufacturer of light-curing resins, Boxing New Materials can custom-produce matching light-curing resins for 3D printing according to customer requirements. We welcome your inquiries and invite you to request samples for testing.
Disclaimer: The above content is sourced from the internet and is for reference only. If any infringement occurs, please contact us, and we will remove it promptly.
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