Maya Ellison
The strength of 3D-printed plastic parts is a key consideration for designers, engineers, and hobbyists using 3D printing technology. While 3D-printed plastic parts are commonly used due to their versatility and cost-effectiveness, their strength and durability are highly dependent on the type of plastic used, the printing process, and the intended application. Various plastics, such as PLA, ABS, PETG, nylon, and polycarbonate, offer different levels of strength, durability, flexibility, and impact resistance, making them suitable for different purposes. Understanding the unique properties of each type of plastic and selecting the appropriate material for the specific application is crucial to optimizing the toughness and performance of 3D-printed plastic parts.
| Characteristics | Values |
|---|---|
| Strength | Varies depending on the material used, with some plastics being stronger than others. |
| Durability | Some plastics are more durable than others, with ABS and PETG being more durable than PLA. |
| Impact Resistance | ABS and PETG offer better impact resistance than PLA. Nylon also has high impact resistance. |
| Stiffness | PLA is stiffer than ABS. |
| Flexibility | PETG and nylon offer more flexibility than PLA. |
| Heat Resistance | ABS is more heat resistant than PLA. Polycarbonate and PEEK also offer high heat resistance. |
| Tensile Strength | The tensile strength of PLA is 7,250 psi. |
| Fatigue Properties | Poor fatigue properties, with a high risk of brittle failure. |
| Ease of Printing | Some plastics are easier to print than others, with PLA and PETG being easier to print than ABS and nylon. |
| Cost | The cost of plastics varies, with PLA being one of the most cost-effective options. |
| Environmental Impact | PLA is biodegradable and derived from renewable resources, making it a more environmentally friendly option. |
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What You'll Learn
The importance of material selection
When selecting a material, it is crucial to consider the desired quality requirements and prioritize the material properties, visual appearance, and the 3D printing process. Material properties can be categorized into physical, chemical, thermal, magnetic, optical, and mechanical properties.
The most common materials used in 3D printing are Acrylonitrile Butadiene Styrene (ABS) and Polylactic Acid (PLA). PLA is typically used by hobbyists as it is stronger, more affordable, and easier to use, but it is less heat resistant than ABS. ABS, on the other hand, is more flexible, durable, and impact-resistant, making it ideal for prototyping and functional parts.
Other materials used in 3D printing include Polyethylene Terephthalate Glycol (PETG), Nylon, Polycarbonate, and Carbon-fiber-reinforced filaments. Each material has unique properties that make them suitable for specific applications. For instance, PETG offers a balance between flexibility and toughness, while carbon-fiber-reinforced filaments provide lightweight yet rigid parts.
The selection of the right material is critical to ensuring that the final product meets the required specifications and performs as expected. It is also essential to evaluate the material's ability to meet expectations and requirements related to performance, cost, and quality.
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Pros and cons of PLA
Polylactic acid, commonly known as PLA, is one of the most popular materials used in 3D printing. It is a thermoplastic polymer derived from renewable resources such as corn starch, sugarcane, or tapioca. It is a popular choice among industrial manufacturers and hobbyists due to its ease of use, low cost, and environmental friendliness.
Pros of PLA
- Ease of use: PLA is generally easier to print with than other materials, such as ABS, as it is stickier and does not require a heated bed. It can be printed at a low temperature, starting from around 180°C, which makes it less likely to warp and clog the nozzle during the printing process.
- Low cost: PLA is inexpensive and cost-effective, making it a great option for those who are new to 3D printing or those on a budget.
- Environmental friendliness: PLA is derived from natural, renewable sources and is biodegradable, making it one of the most environmentally friendly filaments available.
- Sweet aroma: The printing process with PLA gives off a sweet aroma, which is pleasant for users.
Cons of PLA
- Brittleness: PLA tends to be brittle, making it more suitable for aesthetic or rigid, non-load-bearing applications rather than mechanical purposes. Prints made with PLA can be prone to shattering under stress.
- Food safety concerns: While PLA containers are food-safe when not 3D printed, the 3D printing process creates tiny gaps and pores between the layers, allowing for the build-up of bacteria and mould. Therefore, 3D printed PLA is not considered food-safe.
- Oozing and stringing: PLA has a tendency to continue flowing during travel movements, creating strings or hairs on the printed object. This can result in flawed prints and requires additional steps, such as using a cooling fan, to prevent the issue.
- Moisture absorption: PLA filaments are hygroscopic, meaning they attract moisture from the air. Improper storage can lead to moisture absorption, causing issues such as bubbling during printing.
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Pros and cons of ABS
Acrylonitrile Butadiene Styrene (ABS) is a widely used thermoplastic polymer, known for its versatility, durability, and ease of processing. It is used in a variety of industries, including automotive parts, consumer goods, electronics, and toys. ABS is also a popular choice for prototyping due to its toughness, lightweight, and chemical resistance.
Pros of ABS:
- Durability: ABS is known for its high impact resistance and overall strength, making it suitable for applications that require mechanical strength and resilience.
- Flexibility: ABS has improved flexibility compared to other plastics like PLA, making it a good choice for applications that require bending or deformation.
- Ease of Processing: ABS can be easily melted and molded, making it simple to manufacture and develop in a lab. It can also be applied to 3D printing to quickly produce components in a variety of sizes and shapes.
- Cost-effectiveness: The simplicity of ABS production translates to lower production costs, which can result in lower consumer costs and potentially more sales.
- Recyclability: ABS is easy to recycle since it is a thermoplastic material that can resist being heated and cooled multiple times.
Cons of ABS:
- Odor and Fumes: ABS produces fumes during printing, so it is important to use it in well-ventilated spaces and with an enclosed printer that has a filtration system.
- Warping: ABS requires a heated bed during printing to prevent warping and improve layer adhesion.
- Printing Difficulty: The higher printing temperature and need for a heated bed can make ABS more challenging to print, especially for hobbyists or those without specialized equipment.
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Pros and cons of PETG
3D-printed plastics are widely used due to their versatility and cost-effectiveness. However, the strength and durability of 3D-printed plastic parts depend on the type of plastic used. One such plastic that is gaining popularity is PETG, a thermoplastic that combines the qualities of PLA and ABS.
Pros of PETG
PETG is a versatile, semi-translucent material that is durable, impact-resistant, and easy to print. It is ideal for applications requiring high strength and impact resistance, such as mechanical parts and industrial manufacturing. It is also used in fashion accessories and custom cosplay pieces due to its translucent properties and smooth finish.
Cons of PETG
Like ABS, PETG is prone to warping as it solidifies quickly, which may affect the end product's look. It is also prone to stringing and oozing, which can be mitigated by adjusting the nozzle temperature. While PETG is strong and safe for food use, it is not the most cost-efficient or biodegradable option, with PLA being a more affordable and environmentally friendly alternative.
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Pros and cons of nylon
3D-printed plastics are commonly used due to their versatility and cost-effectiveness. However, the strength and durability of these parts are essential considerations. Nylon, or polyamide, is a widely used engineering thermoplastic with unique properties. It is a synthetic polymer that was first developed in the 1930s and has since become an integral part of modern manufacturing.
Pros of Nylon
Nylon is known for its strength, durability, and resistance to abrasion. It is a versatile material used in various applications, from industrial products to textiles and clothing. Here are some specific advantages of nylon:
- Strength and Durability: Nylon is a strong and durable material, making it ideal for creating functional parts.
- Flexibility: Nylon offers some flexibility, making it suitable for applications that require mechanical strength and resilience.
- High Impact Resistance: Nylon can withstand high impact without breaking, which is essential for certain applications like automotive components.
- Lightweight: Nylon composites, such as carbon-fiber-reinforced nylon, provide lightweight yet rigid structures suitable for structural use.
- Ease of Use: Nylon is easy to melt into sheet stock, filaments, films, and fibers, making it versatile for different manufacturing processes.
- Hypoallergenic: Nylon fibres resist the development of mould and mildew, making them suitable for certain medical applications.
- Affordability: Nylon is widely available and affordable, making it accessible for various applications.
Cons of Nylon
While nylon has numerous advantages, there are also some drawbacks to consider:
- Environmental Impact: Nylon is not biodegradable, which raises concerns about its long-term environmental impact. However, recycled nylon is becoming more common, reducing the need for new materials.
- Prone to Pilling and Static Cling: Nylon can be prone to pilling, and static cling may occur, which can be undesirable for certain applications.
- Water Absorption: Nylon easily absorbs water, which can influence its dimensional stability and electrical properties. This property limits its use in certain applications.
- Light Sensitivity: Nylon has poor light resistance and can be easily oxidized when exposed to air and high temperatures for an extended period, leading to discolouration and potential degradation.
- Ventilation Requirements: When using nylon in 3D printing or certain manufacturing processes, adequate ventilation is necessary due to potential fumes and odours.
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Frequently asked questions
The toughness of 3D-printed plastic varies depending on the type of plastic and the printing technique used. Some common plastics used for 3D printing include PLA, ABS, and PETG, each with its own unique properties, applications, and toughness.
The toughness of a 3D-printed plastic part depends on the material used, the design, and the printing settings. Advanced materials like nylon, polycarbonate, and carbon-fiber-reinforced filaments provide exceptional strength and durability. Polycarbonate, for example, is known for its high toughness and is used in manufacturing bulletproof glass.
PLA (Polylactic Acid) is a popular material for 3D printing due to its ease of use, low cost, and environmental friendliness. However, PLA is known to be brittle under heavy loads and may not be suitable for bearing heavy loads. It has a tensile strength of 7,250 psi.
ABS (Acrylonitrile Butadiene Styrene) is a widely-used thermoplastic known for its durability, impact resistance, and overall strength. It is commonly used for prototyping and functional parts. ABS is tougher and more flexible than PLA but is less stiff.
Yes, in addition to the material selection and design, the quality of calibration and printing settings can also impact the toughness of 3D-printed parts. It is important to ensure that the material is printed with high-quality settings and the correct orientation to improve durability.
