Sofia Martinez
The durability of 3D-printed plastic parts is influenced by several factors, including the type of plastic, the printing process, and the structural design. While some plastics are stronger and more durable than others, the printing process also plays a crucial role in determining the strength of the final product. Factors such as layer height, line width, infill density, and part orientation can significantly impact the durability of 3D-printed plastic objects. Additionally, the printing process can affect the strength of the object, with smaller layer heights generally resulting in stronger and more durable parts. The structural design of the object also matters, as layers can split or crack, leading to brittle failure. Overall, while 3D-printed plastic parts can be durable, their strength depends on a variety of factors that must be carefully considered during the design and printing process.
| Characteristics | Values |
|---|---|
| Durability | Depends on the material used, structural design, part orientation, printing process, layer height, line width, wall thickness, infill density, and printer settings. |
| Strength | Varies with the material used. Generally, plastics are not as strong as metals and ceramics but are strong enough for a range of applications. |
| Tensile Strength | The maximum stress a material can withstand before breaking or deforming. Industrial-grade resins can have a tensile strength of up to 8,000 psi, while commonly used resins have a tensile strength of around 3,300 psi. PLA, a commonly used plastic, has a tensile strength of 7,250 psi. |
| Heat Resistance | The ability of a material to withstand high temperatures without damage. Industrial-grade thermoplastics exhibit high heat resistance. PAHT CF15 and PET-G are examples of heat-resistant materials. |
| Fatigue Properties | 3D-printed plastics may have poor fatigue properties, making them susceptible to crack propagation between layers and brittle failure. |
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Material choice
The durability of a 3D-printed object depends on several factors, including the material used, the structural design, part orientation, and the printing process. The most commonly used materials for 3D printing are plastic, metal, and ceramic. Generally, plastic materials used in 3D printing are not as strong as metals and ceramics, but they are strong enough for a variety of applications.
One of the most popular materials for 3D printing is Polylactic Acid (PLA), a biodegradable thermoplastic derived from renewable resources such as corn starch, sugarcane, or tapioca. It is easy to use, low cost, and environmentally friendly. However, it can become brittle, making it unsuitable for applications under heavy loads, and it can easily break along the layers if not printed properly. A smaller layer height generally results in better layer adhesion, leading to stronger and more durable parts.
Another commonly used material is Acrylonitrile Butadiene Styrene (ABS), which is strong and impact-resistant, but not as strong as metals such as aluminum or steel. Nylon is also becoming a popular choice for 3D printing, as it is flexible, reducing the likelihood of breaking under applied forces, and has a slippery surface, making it ideal for gears, bearings, and ball joints. However, it is difficult to print with and more expensive than normal plastic.
Industrial-grade thermoplastics are extremely heat-resistant and can produce parts with great detail and durability. Polycarbonate is generally considered the strongest 3D printed filament, while industrial-grade resins can have a tensile strength of up to 8,000 psi, making them extremely durable.
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Layer height
The optimal layer height will depend on the specific 3D printing process and the purpose and design of the component. For example, if the object has lots of detail, holes, curves, or angled surfaces, a smaller layer height will usually be required. The nozzle diameter will also determine the layer height, as the maximum layer height should not exceed 80% of the nozzle diameter, and the minimum should not go below 20%. Most FDM printers work with layer heights between 0.05 and 0.4 mm, with 0.2 mm being the most common setting.
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Structural design
The structural design of 3D-printed plastic parts is a critical aspect of ensuring their durability and strength. Several factors come into play when considering the structural design of these components.
Firstly, the choice of material significantly impacts the strength and durability of 3D-printed plastics. Common plastics used for 3D printing include PLA, ABS, PETG, and Polycarbonate. Each material has unique properties, such as heat resistance, stiffness, and impact resistance. For instance, Polycarbonate is known for its strength and resistance to high temperatures, while ABS offers impact resistance. The structural design must consider the specific material properties to ensure the final product meets the desired durability requirements.
Secondly, the layer height, or layer thickness, plays a crucial role in the structural integrity of 3D-printed plastics. Smaller layer heights generally result in stronger parts with better layer adhesion. This is because thinner layers produce a more robust product, whereas thicker layers tend to yield weaker structures. Additionally, the printing angle and slicing angle can influence the strength of the layers, with the potential for crack propagation between layers in some cases.
Another factor to consider in structural design is infill percentage, which refers to the percentage of solid material within a printed part. A higher infill percentage results in a denser and potentially stronger object. Part orientation is also significant, as the bond between the layers is critical to the overall strength, and the unique stresses and performance requirements of the object must be considered during the design process.
Furthermore, 3D-printed materials exhibit anisotropic behaviour, meaning their strength varies depending on the direction of the applied load. This property adds complexity to the structural design process, as traditional assumptions about material homogeneity may not apply.
Lastly, the structural design of 3D-printed plastics can be enhanced by utilising hybrid materials. For example, combining PLA with other materials, such as bamboo or cork, can create a more organic final structure. Additionally, soluble materials like HIPS and PVA can be incorporated into the design, allowing for specific sections to be dissolved during the manufacturing process, creating intricate geometries.
In conclusion, the structural design of 3D-printed plastics requires careful consideration of material choice, layer height, infill percentage, part orientation, anisotropic behaviour, and the utilisation of hybrid materials. By optimising these factors, designers can create durable and robust 3D-printed plastic parts suited to a wide range of applications.
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Heat resistance
The heat resistance of 3D-printed plastic depends on the type of plastic used. Some plastics are more heat resistant than others, and the heat resistance of a 3D-printed object will depend on the specific type of plastic filament used in its printing.
Nylon is a highly capable engineering thermoplastic that is resistant to UV, light, heat, moisture, solvents, temperature, and water. It is available in multiple variants, each tailored to different applications. For instance, Nylon 11 CF Powder parts are ideal for replacement and spare alternatives to metal parts, with an HDT (Heat Deflection Temperature) of 188 °C at 0.45 MPa. Nylon 12 Powder is another highly capable material for functional prototyping and end-use production, with an HDT of 171 °C at 0.45 MPa.
Polypropylene (PP) is another plastic with good heat-resistant properties. It is a lightweight, durable thermoplastic polymer with a high melting point, making it suitable for items that may be subjected to heat. It is flexible, with excellent electrical insulation and good fatigue resistance. Its HDT is 113 °C at 0.45 MPa. A variation of this is PP GF30, which has a higher heat deflection temperature of 120 °C and is used in the automotive and aerospace industries.
Other plastics with good heat-resistant properties include PETG, with an HDT of 65 °C, and Acrylonitrile Butadiene Styrene (ABS), which requires a high temperature for printing (220-250 °C) and is used for automotive components, enclosures, and toys.
There are also other materials that can be used for heat resistance in 3D printing, such as resins, metals, and ceramics. For example, Ultracur3D® RG 3280 is a photopolymer resin with a Heat Deflection Temperature of over 280 °C.
The choice of material depends on the specific requirements of the application, including temperature exposure, mechanical stresses, and environmental conditions.
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Tensile strength
The tensile strength of a material is a measure of its resistance to being pulled apart. Standardised tests are used to determine the tensile strength of 3D-printed parts, which are printed according to ASTM D638 or ISO 527 standards. The test involves placing the specimen in a tensile testing machine and applying a controlled pulling force until the specimen fails. The maximum stress endured before breaking indicates its tensile strength.
PLA (polylactic acid) is a commonly used 3D printing material with a tensile strength of 50 MPa or 7,250 psi. It is a reasonably strong, biodegradable material with a low melting point, typically around 200-220°C. However, PLA is more brittle than other materials such as ABS or PETG, and it can degrade when exposed to light. Therefore, it may not be suitable for applications requiring high mechanical strength or load-bearing designs.
ABS (acrylonitrile butadiene styrene) is another widely used 3D printing material with a tensile strength of 33 MPa or 4,700 psi. It is an engineering-grade material used in everyday items and is more stable than PLA. However, it has slightly less tensile strength and is less stiff than PLA.
Other materials with higher tensile strength than PLA and ABS include nylon, with a tensile strength of 48 MPa or 7,000 psi, and polycarbonate, with a tensile strength of 68 MPa or 9,800 psi. These materials offer exceptional strength, toughness, and durability, making them suitable for functional applications such as hinges and high-strength components.
The tensile strength of 3D-printed parts can be customised by carefully selecting the material, design, and print settings. For example, using a strong infill pattern, optimising print orientation, and increasing wall thickness can improve the tensile strength of FDM 3D-printed parts. Additionally, post-processing methods such as annealing and epoxy coating can also enhance the tensile strength of 3D-printed parts.
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Frequently asked questions
The durability of 3D-printed plastic depends on several factors, including the type of material used, the structural design, part orientation, and the printing process. Generally, 3D-printed parts can be just as strong and durable as components made from other materials. However, some types of plastic are stronger and more durable than others, and the printing process can also affect durability.
The material used is a significant factor in determining the durability of 3D-printed plastic. For example, industrial-grade thermoplastics are extremely heat-resistant and durable, while consumer-grade plastics like PLA tend to be weaker. Other factors include the layer height or thickness, infill density, and part orientation.
The strongest 3D-printed plastics use industrial-grade thermoplastics such as Polycarbonate, ABS, or Nylon. These materials are stronger than consumer-grade plastics like PLA and offer more flexibility, reducing the likelihood of breaking.
