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The earliest commercial 3D printing technology

Release time:

2025-01-10 17:04

The earliest commercial 3D printing technology

The stereolithography process, also known as stereolithographic fabrication and abbreviated as SLA, refers to a manufacturing method that uses ultraviolet light to induce a polymerization reaction in liquid photosensitive resin, thereby curing it layer by layer and producing a three-dimensional solid object. Parts fabricated using SLA boast high dimensional accuracy and represent one of the earliest commercially available 3D printing technologies.

As one of the earliest 3D printing technologies, SLA technology is also the most mature 3D printing technology and is widely used across various industries. Currently, large-scale industrial photopolymerization 3D printers are primarily based on SLA technology.

SLA technology primarily uses photosensitive resin as its raw material, leveraging the property that liquid photosensitive resin rapidly solidifies when exposed to ultraviolet (UV) light. Typically in liquid form, the photosensitive resin immediately undergoes a polymerization reaction upon exposure to UV light of a specific wavelength, completing the curing process. In SLA, UV light of a particular wavelength and intensity is focused onto the surface of the photosensitive resin, causing it to solidify sequentially—from points to lines, and from lines to surfaces—thus completing the creation of a single layer’s cross-section. Once one layer has been fully drawn, the build platform moves vertically by the height of one layer, and the next layer is then cured. By stacking layers one on top of another, a three-dimensional physical object is gradually constructed. The pattern formation for each layer is precisely controlled by the movement of the laser beam. In theory, the laser beam can move across a very large spatial area. Therefore, SLA technology enables the printing of large-scale models.

SLA advantages:

1. SLA is the earliest rapid prototyping manufacturing process and has a high level of maturity.

2. Prototypes can be directly manufactured from digital models, offering rapid processing and a short product development cycle, with no need for cutting tools or molds.

3. High forming accuracy allows for printing models with rich details and excellent surface quality.

SLA drawbacks:

1. The SLA system has a high initial cost, and its usage and maintenance costs are relatively high.

2. The working environment has relatively stringent requirements. The consumable material is liquid resin, which has a certain odor and must be kept sealed. Additionally, to prevent premature polymerization, it needs to be protected from light.

3. Most molded parts are made of resin, which limits the strength and heat resistance of the printed products, making them unsuitable for long-term preservation.

4. Post-processing is relatively cumbersome. The printed parts need to be cleaned with ethanol or a specific cleaning solution and then subjected to secondary curing.

However, as technology continues to advance, SLA 3D printing technology is expected to play an even greater role in more fields.

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