Omar Khalid
3D printing is a technology that has been around for a while, but it is still evolving and has a lot of complexities. One of the most widely used materials in 3D printing is plastic, specifically polylactic acid (PLA), a biodegradable plastic made from renewable sources. However, 3D printing is not limited to just plastic. It can also involve the use of composites that mimic materials like marble, ceramic, and wood, as well as metals like carbon fibre, and polyamides or nylon materials. While 3D printing has a range of applications, there are concerns about the environmental impact of plastic waste and the durability of 3D-printed items.
| Characteristics | Values |
|---|---|
| Most common 3D printing material | Polymer plastics |
| Other materials used in 3D printing | Metal, carbon fibre, wood, polylactic acid (PLA), acrylonitrile butadiene styrene (ABS), Polyethylene terephthalate (PET), Polypropylene (PP), Polyamides, nylon |
| Environmental impact | Plastic waste, biodegradability, recyclability |
| Applications | Medicine, pharmaceuticals, automotive, aerospace, aviation, racing, consumer goods, manufacturing |
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What You'll Learn
3D printing is useful for repairs
While 3D printing is often associated with plastic, it has various other applications, including repairs. 3D printing is useful for repairs because it can create custom replacement parts that are stronger and more durable than the original part. This is especially beneficial for repairing objects in remote locations where it is difficult or expensive to obtain replacement parts through traditional means.
The 3D printing process for repairs typically involves designing the repair part using 3D CAD software, taking into account the dimensions, shape, and materials to be used. Tools such as a vernier caliper or a scanner can be used to accurately capture the dimensions and shape of the broken part. The design phase is crucial, as it directly impacts the success of the repair. Minor adjustments, such as strengthening thin sections or simplifying complex geometry, can be made to improve 3D printability without compromising the integrity of the repair.
However, in some cases, completely redesigning the part topology may be necessary, presenting a significant design challenge. The skill and determination of the user play a crucial role in determining the success of the repair in such cases. Additionally, the availability of spare parts is a barrier to product repair, and 3D printing can help address this issue by enabling the creation of spare parts, even for products not originally intended to be repaired.
It is worth noting that 3D printing should not always be the first step in replacing a broken part. If affordable and readily available spare parts exist, it may be more sensible to utilise those. 3D printing becomes a more attractive option when the replacement part is unavailable or disproportionately expensive. Furthermore, the longevity and reparability of the repaired product should be considered, as the repair could either strengthen or inadvertently weaken the product.
Overall, 3D printing has the potential to revolutionise the way we approach repairs, offering customisation, durability, and accessibility, especially in remote locations. However, it also presents challenges in terms of design complexity, certification, and the availability of guidance for creating 3D-printed spare parts.
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Plastic waste is a major concern
The versatility of 3D printing allows for the creation of functional and durable items that can extend the lifespan of existing products. For example, 3D-printed parts can be used to repair broken items, preventing them from being discarded and replaced. This shift towards repair and reuse aligns with the growing awareness of the need for a circular economy to address plastic waste. However, it is crucial to acknowledge that 3D printing also has its limitations and potential environmental drawbacks.
One of the primary concerns with 3D printing is the waste generated during the printing process. Failed prints, brims, supports, and other by-products often end up in the trash, contributing to plastic waste. Additionally, the most commonly used 3D printing material, polylactic acid (PLA), is marketed as a biodegradable alternative. However, its biodegradability is contingent on specific industrial composting conditions that are often inaccessible to consumers. As a result, PLA waste frequently ends up in landfills or incinerators, contributing to environmental pollution.
Furthermore, 3D printing can inadvertently encourage the creation of single-use plastic items, which are a significant contributor to environmental damage. The accessibility of 3D printing technology may lead individuals to print items that serve no practical purpose and are destined to be discarded. This practice exacerbates the plastic waste problem, particularly when coupled with the lack of widespread recycling infrastructure for 3D-printed plastics. Therefore, while 3D printing offers potential solutions for reducing plastic waste, it is imperative that users adopt mindful practices and prioritize functional and durable prints over disposable novelties.
To address the plastic waste crisis, a multifaceted approach is necessary. Firstly, improving waste management systems and recycling infrastructure is crucial to prevent plastic from entering waterways and oceans. Secondly, reducing the manufacturing and use of single-use plastics is essential, as these items account for a substantial portion of plastic pollution. Finally, exploring alternative materials and technologies, such as 3D printing with composites that mimic wood, marble, or ceramic, can help reduce our reliance on plastics. By embracing these strategies, we can collectively work towards mitigating the environmental impact of plastic waste and fostering a more sustainable future.
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Biodegradable plastic exists
Biodegradable plastic does exist, and it is commonly used for disposable items such as packaging, cutlery, and food service containers. Biodegradable plastic is defined by its ability to break down completely into natural substances like water, carbon dioxide, and biomass in a reasonable timeframe. This process is carried out by microorganisms under the right conditions.
One of the most widespread 3D-printing materials, polylactic acid (PLA), is a type of biodegradable plastic made from renewable sources like corn starch. It has a low melting point, making it ideal for lightweight and consumer use. PLA is strong, has good adhesion to other materials, and does not expand as much as other materials when heated. However, it is important to note that PLA requires industrial composting conditions to fully break down.
While biodegradable plastic offers a more sustainable alternative to traditional plastic, its production and disposal have environmental implications. For example, growing crops for biodegradable plastic can compete with food production, and not all types of biodegradable plastic are compostable in typical home settings, requiring industrial composting facilities instead. Additionally, biodegradable plastic may have compatibility issues with existing recycling systems.
The environmental benefits of biodegradable plastic depend on sustainable sourcing, proper disposal, and advancements in recycling technologies. For instance, compostable takeout containers can play a helpful role in reducing waste as they can be composted along with the remaining food residue. However, it is important to understand that biodegradable and compostable plastic alone will not solve the plastic pollution crisis.
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Other materials are used
While plastic is the most common material used in 3D printing, other materials such as metal, carbon fibre, and nylon are also used. One of the key advantages of 3D printing is its ability to create composites, which can mimic materials like marble, ceramic, and wood. For example, wood filaments for 3D printing typically consist of 70% Polylactic Acid (PLA) and 30% sawdust or similar wood fibres. This results in a product that looks, feels, and even smells like wood rather than plastic, making it ideal for aesthetic applications.
Carbon fibre is another material that has gained popularity in the 3D printing industry due to its extreme strength and lightweight nature. It is highly valued in the automotive, aviation, aerospace, and racing industries. Similarly, nylon, or polyamide, is widely used in industrial, robotics, aerospace, automotive, and medical sectors due to its durability, toughness, impact resistance, and flexibility.
In the medical field, high-performance polymers are used in 3D printing, requiring printers with a heating plate capable of reaching at least 230°C and an extrusion temperature of 350°C. These polymers are often used in the aerospace, automotive, and medical sectors due to their high strength and flexibility. One such example is Polyethylene Terephthalate (PETG), which is well-suited for applications that require sturdiness and smoothness.
Additionally, 3D printing with metal is becoming more common. Metal 3D printing offers unique advantages, such as creating complex structures with good machinability. High Impact Polystyrene (HIPS) is a type of plastic filament used to support structures in Fused Deposition Modelling (FDM) printers, known for its solubility, smoothness, lightweight, and impact resistance.
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It has broad applications
3D printing is not just good for plastic. While plastic is the most widespread 3D-printing material, the technology has broad applications and can be used with a variety of materials.
One of the superpowers of 3D printing is composites, which can mimic materials like marble, ceramic, and wood. For example, wood filaments for 3D printing are about 70% polylactic acid (PLA) and 30% sawdust or similar wood fibers. The end product looks, feels, and even smells like wood rather than plastic, making it great for aesthetic uses. Similarly, carbon fiber is extremely strong yet lightweight, making it ideal for the automotive, aviation, aerospace, and racing industries.
In the medical, robotics, aerospace, automotive, and industrial sectors, polyamides, or nylon materials, are used for their durability, toughness, impact resistance, and flexibility. Polyethylene terephthalate (PET) is another frequently used plastic that can be combined with other materials, such as glass fiber, to create engineering resins.
High-impact polystyrene (HIPS) is a type of plastic filament used to support structures in fused deposition modeling (FDM) printers. It is smooth, lightweight, water-resistant, impact-resistant, and affordable. Polypropylene (PP) is another thermoplastic that is widely used in the automotive and professional textiles sectors, as well as in the manufacturing of everyday objects, due to its resistance to abrasion and good shock absorption.
While 3D printing has broad applications, there are some limitations to the technology. For example, high-performance polymers can only be printed on 3D printers with a heating plate capable of reaching at least 230°C and an extrusion temperature of 350°C. Additionally, some people view 3D printing as a hobby that produces mostly plastic waste, with functional prints being a small proportion of what is actually made. However, failed prints can be sent to companies that will shred them and turn them into new filament, and biodegradable plastics like PLA can fully degrade in soil over time.
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Frequently asked questions
No, 3D printing is not only good for plastic. While plastic is the most widespread 3D-printing material, other materials such as metal, carbon fibre, polyamides (nylon), polypropylene, and wood filaments can also be used.
3D printing can be used to create items such as a fully-functional acoustic violin, marble, ceramic, and even carbon fibre parts for the automotive, aviation, aerospace, and racing industries.
3D printing has been criticised for creating plastic waste that cannot be recycled in traditional plastic recycling facilities. However, biodegradable plastics such as polylactic acid (PLA) can be used for 3D printing, and failed prints or waste can be sent to companies that will shred and repurpose them into new filament.
