The Seven Major Types of 3D Printing Technologies

3D printing, also called additive manufacturing, covers several distinct processes. Though different, they all share the same key steps. For instance, all 3D printing starts with a digital model, as it's a digital based technology. The part or product is first designed using CAD software or obtained from a digital library as an electronic file. Then, preparation software slices the design file into layers to create path instructions for the 3D printer to follow.

Why seven types?

Additive manufacturing can be categorized based on the products it produces or the materials it uses. The ISO has classified it into seven general types. However, these seven categories of 3D printing also struggle to cover the increasing number of technical sub types and hybrid technologies.

Material Extrusion 3D Printing

Material extrusion lives up to its name: materials are pushed through a nozzle. Typically, the material is a plastic filament, which is melted and extruded through a heated nozzle. The printer deposits the material onto the build platform along a tool path generated by software. The filament then cools and solidifies to form a solid object. This is the most common form of 3D printing. Although it sounds simple, considering the variety of materials that can be extruded, including plastics, metals, concrete, bio gels, and various foods, this is actually a very broad category. 3D printers of this type range in price from $100 to tens of thousands of dollars.

 Subtypes of material extrusion: Fused Deposition Modeling (FDM), construction 3D printing, micro 3D printing, bio 3D printing.
 Materials: Plastics, metals, foods, concretes, etc.
 Dimensional accuracy: ±0.5% (lower limit ±0.5mm).
 Common applications: Prototyping, electrical enclosures, form and fit testing, jigs and fixtures, patterns for casting, buildings, etc.
 Advantages: The lowest cost 3D printing method with a wide range of materials.
 Disadvantages: Generally lower material performance (strength, durability, etc.) and typically lower dimensional accuracy.

1. Fused Deposition Modeling (FDM)
 

FDM parts can be made on various 3D printers using metals or plastics

There's a multi billion dollar market for FDM 3D printers, with thousands of machines ranging from basic to complex industrial models. FDM machines are also called Fused Filament Fabrication (FFF), which is exactly the same technology. Like all 3D printing technologies, FDM starts with a digital model, which is then converted into paths for the 3D printer to follow. In FDM, you load a spool of filament (or several at once) into the 3D printer, which feeds it into the printer's extruder nozzle. The printer heats the nozzle or nozzles to the required temperature to soften the filament, allowing consecutive layers to bond and form a solid part.

As the printer moves the extruder along designated XY plane coordinates, it lays down the first layer. The extruder then rises to the next height (Z plane), repeating the process layer by layer until the object is fully formed. Depending on the object's geometry, supports may be needed for steep overhangs. These are removed after printing, with some materials dissolvable in water or other solutions.

FDM 3D printers offer a wide range of machines for hobbyists, small businesses, and manufacturers (Sources: Creality, Raise3D, Stratasys).

2. 3D Bioprinting

3D bioprinting is similar to traditional 3D printing, but the materials used are significantly different.

3D bioprinting, or bio 3D printing, is an additive manufacturing process that combines organic or biological materials, such as living cells and nutrients, to create natural three dimensional tissue like structures. It can produce anything from skeletal tissue and blood vessels to living tissue. It's used in various medical research and applications, like tissue engineering, drug testing and development, and innovative regenerative medicine therapies. The actual definition of 3D bioprinting is still evolving. Essentially, it works similarly to FDM 3D printing and falls under the material extrusion category (although extrusion isn't the only bioprinting method).

In 3D bioprinting, the material (bio ink) is extruded from a needle to create print layers. Bio inks mainly consist of living substances, such as cells within a carrier material. For example, collagen, gelatin, hyaluronic acid, silk, alginate, or nanocellulose provide a molecular scaffold for structural growth and nutrient support.

3. Construction 3D Printing

Construction 3D Printing

Construction 3D printing is a rapidly growing sub field of material extrusion. The technique involves using oversized 3D printers (usually up to tens of meters tall) to extrude building materials like concrete from a nozzle. These machines typically take the form of gantry or robotic arm systems. 3D construction printing is now used for residential buildings, architectural features, and construction projects ranging from water wells to walls. Some researchers say it could significantly transform the construction industry by reducing labor needs and construction waste.

There are dozens of 3D printed houses in the US and Europe. The development of 3D construction technology is underway to use materials found on the Moon and Mars to build habitats for future expeditions. Printing with local soil as a more sustainable construction method is also gaining attention.

Resinbased 3D printing, or photopolymerization, uses light to selectively cure liquid resin. After each layer is cured, the build platform shifts slightly (0.01 0.05 mm), and the process repeats until the object is complete. The object is then cleaned and postcured to enhance its mechanical properties.

Common forms of this process include Stereolithography (SLA), Digital Light Processing (DLP), and Liquid Crystal Display (LCD)/Masked SLA (MSLA). The key differences between these technologies lie in their light sources and curing methods.

Bucket polymerization uses light to harden photosensitive resin layer by layer.

Some 3D printer manufacturers, especially those making professional grade machines, have developed unique, patented photopolymerization variants. Hence, different named technologies are visible in the market. Carbon, an industrial 3D printer manufacturer, employs Digital Light Synthesis (DLS) in its vat photopolymerization. Stratasys's Origin names its technique Programmable Photopolymerization (P3), Formlabs offers Low Force Stereolithography (LFS), and Azul 3D first commercialized vat photopolymerization in the form of High Area Rapid Printing (HARP). The market also has Lithography based Metal Manufacturing (LMM), Projection Micro Stereolithography (PμSL), and Digital Composite Manufacturing (DCM), which introduces functional additives into liquid resin.

Types of 3D printing technologies: Stereolithography (SLA), Liquid Crystal Display (LCD), Digital Light Processing (DLP), Micro Stereolithography (μSLA), etc.
Materials: Photopolymers (castable, transparent, industrial, biocompatible, etc.)
Dimensional accuracy: ±0.5% (lower limit of ±0.15mm or 5nm with μSLA)
Common applications: Prototyping and end use polymer parts, jewelry, dentistry, consumer products
Advantages: Smooth surfaces, fine details

1 Stereolithography (SLA)

Stereolithography (SLA) examples from 3D Systems, DWS, and Formlabs.

Stereolithography (SLA), the world's first 3D printing technology, was invented by Chuck Hull in 1986. He patented it and set up 3D Systems to commercialize it. Now, it's used by hobbyists and professionals via many 3D printer manufacturers.

SLA uses a laser to solidify resin layers. Most SLA printers use solid-state lasers. Compared to DLP, SLA's point laser takes longer to trace object layers, while DLP hardens entire layers instantly with a flash. However, SLA's laser can produce stronger light, which some engineering - grade resins need.

Micro - stereolithography (μSLA)

It can print micro - scale components with resolutions of 2 - 50 microns. For comparison, human hair averages 75 microns in width. As a "micro 3D printing" technology, μSLA exposes liquid resins to ultraviolet lasers. It differs in using special resins, complex lasers, and lenses to create extremely small focal points.
 

Nanoscribe and Microlight3D are two leading manufacturers of Two - Photon Polymerization (TPP) 3D printers (Sources: Nanoscribe, Microlight3D).

Two - Photon Polymerization (TPP)

2PP, is another micro - 3D printing technology and a form of SLA. Using pulsed femtosecond lasers focused on a spot in a vat of special resin, TPP can print parts as small as 0.1 microns by solidifying resin at that spot. TPP creates tiny voxels (3D pixels) and builds parts layer by layer. It's used in research, medical applications, and micro - component manufacturing, like micro - electrodes and optical sensors.
 

2 Digital Light Processing (DLP)

DLP 3D printing uses a digital light projector to flash each layer's image onto the resin in one go (or multiple times for larger parts). More common than SLA, DLP is efficient for producing larger parts in a single batch, as each layer's exposure time is uniform regardless of the number of parts. The image for each layer is composed of square pixels, forming rectangular voxels. Light is projected onto the resin via LED screens or UV lights, with a Digital Micromirror Device (DMD) directing the light onto the build surface.

Modern DLP projectors use thousands of micrometer - sized LEDs as light sources, individually controlled to boost XY resolution. DLP 3D printers vary significantly based on light source power, lenses, DMD quality, and other components, with prices ranging from $300 to over $200,000.

In "top - down" DLP printing, the light source is at the printer's top, shining down onto the resin vat. These printers flash an image from the top, cure a layer, and then submerge the cured layer back into the vat. A recoater on the vat's top moves across the resin to form a new layer as the build plate lowers. Manufacturers claim this method, which doesn't fight gravity, produces more stable results for larger parts. Conversely, "bottom - up" DLP printers have limited weight capacity for hanging parts from the build plate. The resin vat supports the print during "top - down" printing, reducing the need for support structures.

Projection Micro - Stereolithography (PμSL)
 

As a unique vat photopolymerization type, PμSL is a DLP subcategory and a micro - 3D - printing technology. It uses UV light from a projector to cure specially formulated resin layers. With 2 - micron resolution and 5 - micron - thick layers, this additive manufacturing technique is evolving due to its low cost, accuracy, speed, and material versatility (polymers, biomaterials, ceramics). It shows potential in microfluidics, tissue engineering, micro - optics, and biomedical micro - device applications.

Lithography - based Metal Manufacturing (LMM)

Another DLP - related technology, LMM creates tiny metal parts for surgical tools and micro - mechanical components. In LMM, metal powder is dispersed in photopolymer resin and selectively solidified via blue - light projector exposure. After printing, the polymer is removed, leaving a debinded, metallic part that's sintered in a furnace. Feedstock materials include stainless steel, titanium, tungsten, brass, copper, silver, and gold.

A micro - metal 3D printed part made using LMM technology on an Incus 3D printer.

LCD, or MSLA, is like DLP but uses an LCD screen instead of a DMD, making printers more affordable. The LCD determines print grain, fixing XY precision. Unlike DLP's single light source, LCD uses an array of emitters. LCD resin 3D printing is shifting from consumer to industrial use.

LCD can print faster than SLA in some cases due to whole - layer exposure. Its low LCD unit cost makes it popular for budget desktop resin printers. However, it's also used professionally, with some industrial 3D printer manufacturers pushing its limits and achieving impressive results.

Powder Bed Fusion (PBF) is a 3D printing process where a heat source selectively melts powder particles (plastics, metals, or ceramics) in a build area, creating solid objects layer by layer. In PBF 3D printers, a thin layer of powder is spread over the build bed, usually via a blade, roller, or wiper. Energy from a laser melts specific points on the powder layer. Another powder layer is then deposited and fused to the previous one. This process repeats until the entire object is built, with unfused powder supporting and enclosing the final product.

Comprehensive Guide to 7 Major 3D Printing Technologies and Their Applications (SEO Optimized)

As additive manufacturing (3D printing) technologies continue to mature, more industries are adopting various printing methods to meet the demands for complex structures, high-performance materials, and small-batch customization. This article explores seven mainstream 3D printing technologies-PBF, SLS, LPBF, EBM, Material Jetting, DED, and Binder Jetting-to help businesses and researchers choose and apply the right methods.

1. Powder Bed Fusion (PBF) Technology

PBF enables the production of high-strength, wear-resistant, and durable parts, commonly used in consumer products, industrial tools, and functional components.

Common Materials: Plastic powder, metal powder, ceramic powder
Dimensional Accuracy: ±0.3% (minimum ±0.3mm)
Representative Technologies:
SLS (Selective Laser Sintering)
LPBF (Laser Powder Bed Fusion)
EBM (Electron Beam Melting)

 1.1 Selective Laser Sintering (SLS)

SLS uses a laser to sinter polymer powders (e.g., nylon PA12) layer by layer, requiring no support structures. It is ideal for hollow and complex designs, widely used in functional parts, small-batch production, and medical modeling.

 1.2 Micro Selective Laser Sintering (μSLS)

μSLS is suitable for highly precise micro-metal structures with resolutions below 5μm, used in the production of electronic micro-components.

 1.3 Laser Powder Bed Fusion (LPBF)

LPBF primarily prints metal components such as titanium alloys, stainless steel, and nickel-based alloys. Its high-powered laser and inert gas environment ensure part density and mechanical performance, commonly used in aerospace, medical, and industrial applications.

 1.4 Electron Beam Melting (EBM)

EBM uses an electron beam to sinter metal powder in a vacuum, suitable for conductive and reflective materials like copper and titanium. The high-temperature build environment reduces residual stress, ideal for orthopedic implants and turbine blades.

Material Jetting deposits photosensitive resin or wax in a droplet-based manner, allowing high-resolution, multi-material, and full-color printing.
Common Materials: Photopolymer resin, wax, composites
Dimensional Accuracy: ±0.1mm
Subtypes:
M-Jet (Polymer Material Jetting)
NPJ (NanoParticle Jetting)
M-Jet is used in automotive, medical, and industrial design prototyping with multi-color, multi-material output. NPJ targets precise deposition of metal and ceramic nanoparticle inks for complex metal part fabrication.

Binder Jetting combines powder bed and inkjet technologies by depositing a binding agent onto a powder bed, layer by layer, to form 3D structures.
Common Materials: Metal, ceramic, sand, polymers
Dimensional Accuracy: ±0.2mm (metal) or ±0.3mm (sand)
Variants:
Metal Binder Jetting
Polymer Binder Jetting
Sand Binder Jetting

This technology requires no support structures and offers high production efficiency, suitable for manufacturing colored prototypes and functional metal parts. Metal parts typically undergo debinding and sintering post-processing to enhance mechanical strength.

DED uses laser, arc, or electron beams to melt and deposit metal wires or powders, ideal for large structure printing and component repair.

Materials: Stainless steel, titanium alloy, nickel alloy
Dimensional Accuracy: ±0.1mm
Typical Subtypes:
Laser DED (L-DED)
Electron Beam DED
Arc-based WAAM (Wire Arc Additive Manufacturing)
Cold Spray

DED is widely applied in aerospace, energy, and heavy industry for part repair and large-scale manufacturing.
 

Sheet Lamination stacks layers of paper, polymer, or metal sheets and uses lasers or cutting tools for shaping, ideal for rapid production of non-functional prototypes.
Common Materials: Paper, polymers, metal foils
Dimensional Accuracy: ±0.1mm
Advantages: Multi-material combination, fast production

Disadvantages: High material waste, lower precision

Developed by HP, MJF combines powder deposition with the application of fusing and detailing agents, then uses infrared heating for selective material melting.

Materials: Thermoplastics such as nylon and polypropylene
Applications: Industrial parts, functional prototypes, medical devices
Advantages: Fast printing, no support structures, recyclable powder

Cold Spray: Bonds metal powder without heating, ideal for rapid additive manufacturing.
Molten DED: Deposits liquid metals (e.g., aluminum), potentially using recycled materials.
Composite-Based Additive Manufacturing (CBAM/SLCOM): Combines carbon fiber or glass fiber for high-strength structural parts.
VLM (Viscous Lithography Manufacturing): Enables multi-material combinations on transparent film with easily removable support structures.

Conclusion

3D printing is reshaping the manufacturing landscape, offering unmatched flexibility and design freedom-from mass production to personalized customization. By understanding these seven mainstream additive manufacturing processes, businesses and engineers can select the most suitable 3D printing solution based on material needs, structural complexity, and budget.