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SLA 3D Printing

Utilizing UV light to precisely cure liquid resin layer by layer, ideal for complex, high-detail prototypes, molds, and small-batch production.

High-Precision PrototypingComplex GeometriesSmooth Surface FinishSmall-Batch ManufacturingRapid Prototyping

— Cost

Medium

— Lead Time

Sample 3-7 days · Production 7-14 days

— Suggested MOQ

Ask+

— Materials

8 types

What is it

Stereolithography Apparatus (SLA) 3D printing is an additive manufacturing technology where a computer-controlled UV laser precisely cures liquid photopolymer resin layer by layer into a solid object. The laser scans the surface of the resin according to the sliced paths of a CAD model, causing it to polymerize and harden. This process repeats until the entire object is formed. SLA is renowned for its exceptional detail, precision, and smooth surface finish, making it widely used for concept models, functional prototypes, tooling, and small-batch custom products.

Best for

High-Precision Functional Prototypes
Jewelry Casting Molds (Lost-Wax Casting)
Medical Device Components and Models
Intricate Art Pieces and Sculptures
Custom Electronic Housings
Wind Tunnel Testing Models

Materials

Standard Resin
Tough Resin
Flexible Resin
Clear Resin
High Temp Resin
Castable Resin
Dental Resin
Engineering Resin

Advantages

Extremely high printing precision, with layer thickness up to 0.025mm and XY resolution of 0.05-0.2mm.
Excellent surface finish, reducing post-processing time and cost.
Capable of producing complex internal structures, hollow designs, and intricate textures without traditional molding limitations.
Rapid prototyping capability significantly shortens product development cycles, from design to physical object in just a few days.
Diverse range of resin materials available, allowing simulation of various mechanical properties (e.g., hardness, flexibility, transparency, heat resistance).
Stable printing process, resulting in high dimensional stability of finished parts, with tolerances controllable within ±0.1mm.

Limitations

Material costs are relatively high, especially for specialized functional resins.
Mechanical strength and durability of resin materials are generally inferior to injection-molded engineering plastics, unsuitable for high-stress applications.
Print size is limited by the build volume of the equipment; larger objects require multi-part printing and assembly.
Requires post-processing steps such as cleaning, support removal, and post-curing after printing.
Not suitable for large-scale mass production; unit costs increase significantly with higher quantities.

Frequently Asked Questions

What is the Minimum Order Quantity (MOQ) for SLA 3D printing?+

SLA printing does not have a strict MOQ. As an additive manufacturing process, even a single piece can be produced, making it ideal for prototypes or small-batch customization. Costs primarily depend on object volume, complexity, and post-processing needs, rather than quantity, so producing single or small quantities is often much cheaper than traditional molding.

How strong and durable are SLA printed parts?+

The strength and durability of SLA parts highly depend on the resin type used. Standard resins are typically brittle, suitable for visual models. However, we offer various engineering-grade resins like tough, high-temp, or PP/ABS-like resins, providing better mechanical properties for functional prototypes or low-stress parts, though generally not matching injection-molded engineering plastics.

How smooth can SLA printed surfaces be? Is additional treatment needed?+

SLA printed parts inherently have a very smooth surface, generally superior to FDM or SLS technologies. For most applications, parts are ready after support removal, cleaning, and post-curing. For higher requirements, further post-processing like sanding, polishing, painting, or electroplating can achieve mirror-like or specific color effects, maintaining tolerances within ±0.1mm.

What is the typical lead time for SLA 3D printing?+

SLA printing is known for its speed. Generally, the lead time for sampling (single or small prototypes) is about 3-7 business days. For small-batch production (tens to hundreds of pieces), it takes approximately 7-14 business days, with specific times adjusted based on object complexity, size, and post-processing requirements.