After nearly 30 years of development, 3D printing has revolutionized model making. Consequently, global demand for high-quality 3D printing products is surging. In this guide, I will break down the primary 3D printing technologies currently available. If you need specialized models or spare parts, feel free to contact our engineering team.

1. SLA: Stereolithography (Light Curing)

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SLA stands as the most popular additive manufacturing process. It utilizes ultraviolet (UV) lasers to solidify liquid photopolymer resin layer by layer. Guided by CAD software, the laser draws precise shapes on the resin surface. Once a layer cures, the platform moves, allowing the process to repeat until the 3D object is complete. Most customers choose SLA because it offers a cost-effective way to verify both function and appearance.

2. SLS: Selective Laser Sintering

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SLS technology creates strong, geometrically complex parts without needing support structures. A high-power CO2 laser fuses small particles of thermoplastic powder into a solid shape. During scanning, the laser selectively melts the material on a powder bed. Afterward, the bed drops by one layer, and a roller applies fresh powder. Because the surrounding powder supports the part, engineers can design intricate internal geometries easily.

3. DMLS: Direct Metal Laser Sintering

Direct Metal Laser Sintering (DMLS) targets high-performance metal applications. This technique uses a high-power Yb laser to weld thin layers of metal alloy powders. Typically, these layers measure only 20 to 30 microns thick. The machine builds fully functional metal parts directly from 3D data, making it ideal for aerospace or medical components.

4. FDM: Fused Deposition Modeling

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FDM remains a versatile choice for durable industrial parts. It extrudes thermoplastic fibers through a heated nozzle to build layers. Notably, FDM is the only process that utilizes production-grade materials like ABS, Polycarbonate, and ULTEM 9085. These materials offer excellent thermal stability and chemical resistance. Industries frequently use FDM for jigs, fixtures, and end-use parts.

5. DLP: Digital Light Processing

DLP technology shares similarities with SLA but offers faster production speeds. Instead of a single laser point, DLP uses a high-resolution projector to flash a whole layer of resin at once. This light projector cures specific areas of the liquid photosensitive resin instantly. Because it processes entire layers simultaneously, DLP significantly reduces total print time for large batches.

6. PolyJet: High-Resolution UV Jetting

PolyJet technology functions similarly to a traditional inkjet printer. However, instead of ink, it jets liquid photopolymer that cures under UV light. It can produce layers as thin as 16 microns, resulting in incredibly smooth surfaces. Furthermore, PolyJet allows for multi-material printing, enabling different colors and hardness levels within a single molded part.

7. Industrial-Grade Technologies (MJP, JCP, and 3DP)

Specialized applications often require MJP or JCP technologies. MJP utilizes piezoelectric printing for extreme Z-axis resolution, while JCP excels in full-color inkjet modeling. Additionally, 3DP technology uses a binder jetting method on a powder bed. These processes are essential for creating realistic demonstration models and complex architectural prototypes.

8. Advanced Cladding and Lamination (DED and LOM)

DED (Directed Energy Deposition) focuses on large-scale metal parts by melting material as it exits a nozzle. Although its precision is lower, its molding space is virtually unlimited. In contrast, LOM (Laminated Object Manufacturing) stacks and cuts sheets of material like cardboard or metal. While LOM is less common for complex shapes, it remains a unique solution for specific industrial lamination needs.

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Barry Zeng
Manufacturing Engineer, Shanghai Yunyan Prototype & Mould Manufacture Factory
Expert in CNC Machining and 3D Printing Solutions.