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The Seven Types of 3D Printing

Release time:

2025-01-10 17:03

3D printing can be categorized into seven major types, including material extrusion, binder jetting, powder bed fusion, material jetting, sheet lamination, directed energy deposition, and stereolithography. Below, we’ll provide a detailed introduction to each of these seven categories.

I. Material Extrusion

The principle behind material extrusion is to heat and melt the material, then extrude it through a nozzle and deposit it layer by layer onto a build platform along a pre-set path, thereby gradually constructing a solid object. Although plastic filaments are the most common materials used, the range of materials that can be extruded is remarkably broad, encompassing metals, ceramics, polymers, concrete, bio-gels, and even food.

II. Powder Bed Fusion

Powder bed fusion is a process in which solid objects are built up layer by layer by selectively melting powder particles—such as plastics, metals, or ceramics—using a thermal energy source. The process begins by spreading a thin layer of powdered material onto the print bed, after which a laser melts and fuses the powder at specific points on that layer. A new layer of powder is then applied and bonded to the previous one. This process is repeated until the entire object is fully printed. The final product is encased and supported by the unfused powder, eliminating the need for additional support structures.

III. Material Jetting

Material jetting builds objects layer by layer by depositing tiny droplets of material onto a build platform and then solidifying them. This process typically uses photosensitive polymers or waxes, which rapidly harden upon exposure to light. A notable feature of material jetting is its ability to print different materials on the same object, allowing for the blending of multiple colors and textures. This capability makes material jetting particularly well-suited for producing complex multi-material parts and highly realistic models.

4. Binder Jetting

Binder jetting works by selectively spraying a liquid binder onto a layer of powdered material, thereby bonding the particles together. It combines features of both powder-bed fusion and material jetting. Similar to powder-bed fusion, binder jetting can utilize a wide variety of powdered materials, such as metals, plastics, ceramics, wood, or even sugar. Like material jetting, it employs an inkjet head to precisely deposit the liquid binder onto the powder layer. Regardless of the type of powdered material used, the binder jetting process remains fundamentally the same: the powder is bonded layer by layer until a complete three-dimensional object is built.

5. Sheet Lamination

The core of sheet lamination technology lies in stacking and laminating extremely thin material sheets layer by layer to build 3D objects. The layered structure is then cut into the desired shape using mechanical or laser cutting methods. The material layers can be bonded together using various techniques, including heating, ultrasonic welding, or adhesives—depending on the materials involved, which range from paper and polymers to metals. When parts are laminated and subsequently laser-cut or machined into their final shapes, this process generates more waste than other 3D printing technologies.

6. Directed Energy Deposition

Directed energy deposition is a process that uses a high-energy source—such as a laser, electron beam, or arc—to melt metallic materials and deposit them onto a substrate, layer by layer, to build the desired shape. Typically, metal powders or metal wires are used as raw materials. Because this process is similar to welding, it can be employed for repairing, modifying, or fabricating metal components.

7. Stereolithography

Stereo-lithography is a 3D printing process that uses a light source to selectively cure photosensitive resin. The principle behind this technique is to precisely illuminate specific points or areas of liquid resin with light, causing them to harden into solid structures. After each layer is cured, the build platform moves upward or downward by a small distance—typically between 0.01 and 0.05 millimeters—before the next layer is cured and bonded to the previous one. This layer-by-layer process continues until the complete 3D part is formed. Once printing is complete, the object usually needs to be cleaned to remove any excess liquid resin, and then subjected to post-curing treatment using sunlight or ultraviolet light to enhance its mechanical properties.

The above is an introduction to the seven major types of 3D printing.

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