In the vast array of 3D Printing, the choice of 3D printing materials determines the achievement of the intended goal in any project. One crucial factor that defines the possibilities of 3D printing is the variety of materials available. Each material differs in its application properties. Among these, PLA, ABS, PETG, and Nylon are more popular due to their usability and adaptability to various applications.
Titanium, stainless steel, and other metals like Aluminum are primarily used for industrial purposes. In these applications, strength and endurance are crucial. Ceramics are used because of their high-temperature tolerance and wear resistance capabilities. Fibers like carbon provide strength and lightweight features, while resins, particularly photopolymers, are used for precision work in industries including dentistry and jewelry.
According to the selected materials, they have their role and add some characteristics to the additive manufacturing field. This article provides an in-depth exploration of the development of materials used in 3D Printing, their performance comparison, suitable applications, and cost comparison. By the end of this guide, you will have a clear understanding of the materials. You’ll know which one is most appropriate for your 3D printing requirements.
Types of 3D Printing Materials
Polymers
Most 3D Printing Materials are polymers because they are versatile and can be used in many areas. PLA has a reputation for being eco-friendly and straightforward to work with. As such, it’s suitable for novice users and generating prototypes. ABS supplies more strength and stability that are ideal for rigorous applications. PETG has both PLA and ABS characteristics, offering strength and chemical resistance for used parts. At the same time, Nylon is the most robust, flexible, and wear-resistant material, suitable for high-stress engineering applications. Some polymers have high strength and are typically used in aerospace, while others are used in circuit boards due to their flexibility.
Polymer materials have been crucial in advancing 3D printing technology, which started in the 1980s with the commercialization of stereolithography. The history of critical polymers such as polyamides and PLA was in the early 20th century, and significant AM precursors were developed in the 1920s and the 1940s. FFF and SLS were first developed in the 1980s and early 1990s, and they benefitted from the technological expansion of computers.
With the expiration of patents in early 2000, the implementation of 3D printing technology spread to other industries such as medicine and aerospace. After 2010, improved materials such as intelligent polymers have expanded AM from proto-typing to direct tooling and production of final products. On top of that, cheaper and available software and open-source tools have boosted 3D Printing for the public.
3D Printing Process For Polymer And Composites
Laminated object manufacturing is a common 3D printing process. However, it’s not recommended for creating objects from polymers, as well as selective laser sintering and direct metal laser sintering, as they are well established for creating objects from polymers and polymer composites, using FFF, SLA, MJ, BJ, and PBF processes.
All methods are characterized by different applicability and certain features depending on the polymer’s conditions, such as shape, state, or other physical properties. However, some limitations need to be considered every time a specific technique of 3D Printing is chosen, including compatibility with certain materials, usable cost, requirement in terms of resolution, and the complexity of the geometries used.
This review introduces and explains these methods, outlines the kinds of polymers that can be used, and describes their advantages and disadvantages, shown in the following diagram.
Pic Source: https://www.sciencedirect.com/science/article/pii/S2590238521005178
Pic Source: https://www.sciencedirect.com/science/article/pii/S2590238521005178
Metals
Essential metals such as Titanium, stainless steel, and Aluminum have significant roles in global 3D Printing for industrial use because of their strength, flexibility, and lightweight properties. Titanium is excellent for aerospace and medicine. Stainless steel is highly versatile and rugged. Aluminum is a light and easy conductor of heat.
Titanium: Strength and Biocompatibility
Titanium has become a favored metal in 3D printing, particularly for applications that demand strength, superior corrosion resistance, and biocompatibility. Its light yet strong structure makes it ideal for aerospace parts. This is especially important for the next generation of aircraft, where minimizing mass without compromising strength is crucial.
Titanium’s biocompatibility makes it suitable for use in the medical industry. It is especially valuable in the manufacture of implants and prosthetic items that integrate with the human body.
Titanium’s high melting point and reactivity make 3D printing challenging. Specific methods like EBM and SLM are required to control the printing environment and prevent oxidation.
The following diagram shows a generic workflow for creating a 3D-printed titanium part using SLM:
Stainless Steel: Versatility and Durability
Another common 3D Printing material is stainless steel. It’s known to be elastic and corrosion-resistant. It offers an excellent combination of strength, flexibility, and corrosion resistance. This makes it suitable for use in almost all industries, from car parts to housewares.
For stainless steel in 3D Printing, DMLS and Binder Jetting can be used in various forms and frameworks due to the flexibility of the two manufacturing processes and their high degree of accuracy in 3D printing shapes.
It also helps create functional parts that are used to withstand high wear and tear and are designed to work in extreme environmental conditions.
The following is a diagram of the DMLS process for stainless steel, illustrating how each layer is fused to create a stiff and sturdy component.
Aluminum: Lightweight and High Conductivity
Due to its low density and good thermal and electrical conductivity characteristics, Aluminum is highly sought after in 3D Printing. These characteristics make it especially important in car manufacturing and electrical applications, where weight reduction and heat dissipation are essential.
Aluminum alloys that can be used in 3D Printing, AlSi10Mg, are printed through SLS or DMLS. These techniques allow for the creation of small, lightweight parts with complex shapes that cannot be made or would be costly in conventional processes.
This property also explains why Aluminum is used for parts that require heat sinks, such as heat exchangers and enclosures for electrical equipment.
This figure illustrates the SLS process for Aluminum. It indicates that the required mechanical properties of the final product are attainable because of the high degree of accuracy and control inherent in the process.
Ceramics
Ceramics are widely used in 3D Printing for their superior high temperature and wear-resistant features. These materials demonstrated a high degree of thermal resistance and resistance to corrosion; hence, they should be adapted to aerospace, automobile, and energy industries.
For example, specific applications, such as turbine blades, heat shields, or other high-performance engine products, require the integration of ceramic components due to their durability and thermal stability.
Some techniques applied to create ceramics using 3D Printing include SLS or Binder Jetting, as they enable the formation of shapes that cannot be easily made through conventional methods.
Moreover, the use of ceramics is gaining importance in applications where wear properties are so crucial because of their high hardness and low coefficient of friction. It is essential in industries like manufacturing and mining, where ceramic liners and nozzles can increase the equipment’s durability and minimize repair costs.
Using sophisticated ceramic 3D printing technologies, complex parts with elaborate geometries and tight dimensional controls are manufactured to deliver high performance in aggressive operating conditions.
Composites
High-performance materials like CFRP are becoming very popular and influencing how 3D Printing is done since they provide increased strength and stiffness and low weight. Carbon fiber composites are valued most for their tensile strength and rigidity and, therefore, have a great demand in applications where high-strength and lightweight materials are required, like the aerospace, automotive, and sporting goods industries.
Applying carbon fibers in a polymer matrix can enable the creation of components whose strength is enhanced while their weight is reduced compared to conventional materials.
Also, the integration of composites in 3D Printing allows the design of structures using unconventional geometries, which cannot be impossible through other techniques. These composite materials are then processed through fused deposition modeling (FDM) with carbon fiber flat line/ ribbon or any other composite approach with further control and direction over the directional nature of these aligned fibers.
Material Properties Comparison
| Material | Tensile Strength (MPa) | Elongation at Break (%) | Conductivity (W/mK) | Cost ($/kg) |
| PLA | 60-70 | 4-10 | 0.13 | 20-25 |
| ABS | 40-50 | 3-5 | 0.18 | 25-30 |
| Nylon | 70-90 | 20-30 | 0.25 | 40-50 |
| Stainless Steel | 480-620 | 10-20 | 15-25 | 150-200 |
| Carbon Fiber PLA | 80-100 | 1-2 | 0.30 | 70-100 |
Engineering Applications of 3D Printing Materials
Polymers: Versatile Materials for Prototyping and Consumer Products
Polymers are essential in 3D Printing, especially for prototyping, consumer products, and education. PLA (Polylactic Acid) is one of the most frequently used materials because of its inexpensive nature, fast printing speed, and environmentally friendly, as well as shiny, smooth surface, which is particularly good for geometrical models and non-usable parts.
On the other hand, nylon is used for manufacturing parts that need to be flexible and robust, and it is used in mechanisms, hinges, gears, and other forced parts. Due to its strength and impact resistance, nylon material can be used for higher-level applications and as a transition from the model to the production level in several sectors.
Metals: High-Strength Materials for Industrial Applications
Because of their outstanding characteristics, metals are essential across various industries, such as aerospace, automotive, and medical devices. It is versatile because of its lightweight and high strength, which makes it suitable for airplane parts or surgical equipment. Stainless steel is chosen for its ability to withstand wear and tear, besides being resistant to rust, which makes it the best option for usage in automotive parts and even medical instruments where reliability is essential and the components are likely to be exposed to harsh conditions for long durations.
These metals facilitate the creation of intricate and high-reliability parts crucial in modern engineering and production processes.
Ceramics: High-Temperature and Wear-Resistant Materials
It is used in applications that require high strength and thermal stability, like turbine blades in aviation or heat-resistant parts in many fields. They also offer very high and stable performance at high temperatures, which applies to biomedical applications, providing durable and suitable implants for body tissue.
Such properties help ceramics withstand various conditions due to their reliability in industrial and medical applications.
Composites: Lightweight and High-Strength Materials
The use of composites is suitable for cases where the material’s strength and weight are of interest, for instance, the part of a drone or articles regarded as sports materials. These materials, such as carbon fiber reinforced polymers, have high tensile strength and are light, thereby suitable for use in components that require high strength and ease of maneuvering.
In these areas, incorporating composites boosts performance and effectiveness without incurring the risks of compromising on strength.
Future Trends in 3D Printing Materials
As 3D printing technology continues to evolve, significant progress in the materials used for additive manufacturing is expected. Biocompatibility and eco-friendliness are two important trends as the electrode material can be both biocompatible and environmentally friendly. As the spotlight shifts towards environmental sensitivity, the trend is developing towards materials that offer good performance but are environmentally friendly. These materials will be helpful in medical sectors, where biocompatible polymers and metals will be used for implants and artificial limbs, cutting on the environmental impact without compromising medical standards.
Besides, advancements in material blends and composites are believed to further the potential of additive manufacturing. Subsequent generations of composites will possess even better mechanical characteristics, such as high strength/weight, high flexibility, and heat resistance, which will extend the application of these technologies to aerospace, automotive, and general consumer goods. Integrating polymers, metals, and ceramics will allow for fine-tuning material properties for manufacturing and open up new advancement opportunities for 3D Printing across various industries.
Conclusion
To reiterate, one of the most critical factors of any additive manufacturing project is the material used in 3D Printing. Every material contributes properties that can enhance, hinder, or even alter the final product’s performance, lifespan, and quality. For instance, Titanium and Aluminum possess high strength-to-weight ratios that are desirable for aerospace and automobiles, while PLA and Nylon are suitable for prototyping and consumer goods, respectively.
To this end, the mechanical properties, thermal resistance, and cost of the available materials can be compared, and decisions made according to the needs of the projects that the manufacturers have in mind. Not only does this process improve the functionality and reliability of the final product, but it also preserves cost issues in the production process or line.
EN 
ES 
FR 
DE 
IT 
PT 
NL 
PL 
AR 
JA 
KO 
ZH