The 7 Types of 3D Technology

When most people picture 3D printing, they imagine a nozzle laying down melted plastic. That is only one branch of a much larger family. Additive manufacturing is officially grouped into seven distinct process categories, each building objects layer by layer but using very different materials and mechanisms.

Understanding these seven types helps you match a technology to a job, whether you are printing a prototype at your desk or a metal part for aerospace. Here is how they break down.

1. Material Extrusion (FDM/FFF)

Fused Deposition Modeling, also called Fused Filament Fabrication, is the most common and affordable process. A heated nozzle melts thermoplastic filament and deposits it in layers. It is the technology behind most desktop printers and is ideal for prototypes, functional parts, and hobby projects. To go deeper, see our comparison of FDM vs SLA.

2. Vat Photopolymerization (SLA/DLP)

This category uses light to cure liquid resin into solid plastic. Stereolithography (SLA) uses a laser, while Digital Light Processing (DLP) flashes an entire layer at once. Both deliver exceptional detail and smooth surfaces, which is why they dominate miniatures, dental, and jewelry work. Learn more in our SLA guide and SLA vs DLP comparison.

3. Powder Bed Fusion (SLS/SLM/DMLS)

Powder bed fusion uses a laser or electron beam to fuse fine powder, layer by layer, with no support structures needed. Selective Laser Sintering (SLS) handles nylon and other polymers, while Selective Laser Melting (SLM) and Direct Metal Laser Sintering (DMLS) fuse metal powders for strong, complex industrial parts.

4. Material Jetting

Material jetting works like an inkjet printer, spraying droplets of photopolymer that are cured with UV light. It can combine multiple materials and colors in a single part and produces smooth, highly accurate, photorealistic models, though the machines and materials are expensive.

5. Binder Jetting

Binder jetting deposits a liquid binding agent onto a powder bed to glue particles together, without heat. It is used for full-color sandstone models, metal parts (later sintered), and sand casting molds. Prints can be brittle before post-processing, so it suits concept models and molds more than functional parts.

6. Directed Energy Deposition (DED)

DED melts material, usually metal wire or powder, as it is deposited by a nozzle using a laser, electron beam, or plasma arc. It is mainly an industrial process used to build large metal parts and, notably, to repair or add material to existing components such as turbine blades.

7. Sheet Lamination

Sheet lamination bonds thin sheets of material, such as paper or metal foil, then cuts each layer to shape. It is a lower-cost way to make full-color models or, in metal versions, to join dissimilar materials. It is the least common of the seven for everyday use.

Choosing the Right Technology

For most makers, the choice is between material extrusion and vat photopolymerization: FDM for durable, everyday parts, and SLA or DLP for fine detail. The remaining processes come into play as budgets and industrial requirements grow. If you are shopping for a machine, our printer rankings can help you narrow it down. For more guides and expert recommendations, explore the resources at 3DGearZone.