Ethan Clarke
3D printing is a versatile process that can be used to create a wide range of products, including miniatures. When it comes to choosing the right plastic for 3D printing miniatures, several options are available, each with its own advantages and disadvantages. Some of the most commonly used plastics for 3D printing include acrylonitrile butadiene styrene (ABS), polylactic acid (PLA), nylon, and polyvinyl alcohol (PVA). ABS is known for its toughness and durability, while PLA is a more affordable option that is easier to print with. Nylon is a relatively new material for 3D printing, offering toughness and resistance to damage, while PVA is water-soluble and useful for creating supports for complex models. Other plastics used for 3D printing include polyethylene terephthalate (PET), polycarbonate (PC), and polyamides. The choice of plastic depends on factors such as cost, ease of printing, durability, and the desired level of detail. Resin printers are also popular for miniatures as they offer greater detail, but they require more care and attention during the printing process.
| Characteristics | Values |
|---|---|
| Plastic Types | Acrylonitrile butadiene styrene (ABS), Polyvinyl alcohol (PVA), Polyamides/Nylon, Polyethylene terephthalate (PET), Polycarbonate (PC), Polylactic acid (PLA), Polypropylene (PP) |
| Printing Process | FDM (Fused Deposition Modelling), SLS (Selective Laser Sintering), SLA (Stereolithography), Powder Bed Fusion, Vat Photopolymerization, Binder Jetting, Material Extrusion, Material Jetting |
| Pros | Low cost, ease of manufacture, versatility, water resistance, reusability, impact resistance, flexibility, strength, transparency, lightweight, durability, recyclability |
| Cons | Rough texture, degradation over time, difficulty in printing, high printing temperatures, prone to shattering, releases harmful chemicals at high temperatures, brittleness, inflexibility |
| Best for Miniatures | PLA, resin, ABS-like resin, PET, nylon |
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What You'll Learn
- PLA plastic is a low-cost option, but it's brittle and not food-safe
- ABS plastic is tough, flexible, and impact-resistant, but requires high temperatures
- Resin is durable and suitable for miniatures, but can be expensive
- PET plastic is ideal for objects intended for food contact
- Polyamides (nylon) are tough, inexpensive, and widely available
PLA plastic is a low-cost option, but it's brittle and not food-safe
Polylactic acid (PLA) is a popular choice for 3D printing miniatures due to its affordability, ease of use, and versatility. It is derived from renewable organic sources like sugar cane or corn starch, making it an environmentally friendly alternative to traditional petroleum-based plastics. However, one of its drawbacks is that it is not food-safe.
PLA is a biodegradable polymer that can be produced using the same machinery as conventional plastics, resulting in a cost-efficient and scalable manufacturing process. It has a low melting temperature, making it user-friendly, especially for beginners in 3D printing. The material is known for its stickiness, which allows it to adhere well to a print base covered in white glue or blue painter's tape, eliminating the need for a heated print bed.
While PLA is a widely used and cost-effective option, it does have some disadvantages. One of its main drawbacks is that it is brittle, making the printed objects prone to shattering under stress. This brittleness can be reduced by adding chemicals, creating what some manufacturers call "tough PLA." However, even with these additives, PLA is not food-safe, limiting its applicability in certain scenarios.
Despite its brittleness, PLA remains a popular choice for 3D printing miniatures due to its low cost and ease of use. The availability of PLA+ further enhances its durability and flexibility, making it a preferred option for creating miniatures and gaming figurines. The ability to blend PLA with metal, wood, and glow-in-the-dark materials also adds to its versatility and appeal for creative projects.
In summary, while PLA plastic is a low-cost and user-friendly option for 3D printing miniatures, its brittleness and lack of food safety are important considerations. For projects requiring durability, flexibility, or food contact, alternative materials like PETG, nylon, or ABS may be more suitable.
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ABS plastic is tough, flexible, and impact-resistant, but requires high temperatures
Acrylonitrile butadiene styrene (ABS) is a commonly used plastic in the 3D printing industry. It is the material used for Lego bricks and is also found in car bodies, household appliances, and roofing applications. ABS is a thermoplastic with a polybutadiene-based elastomer base, which makes it flexible and impact-resistant.
ABS plastic is known for its strength and toughness, making it suitable for applications that require durability. It has high tensile strength and stiffness, with a tensile strength ranging from 45 to 60 MPa, allowing it to resist breakage under load. Its impact resistance can be further amplified by increasing the proportion of polybutadiene in relation to styrene and acrylonitrile. ABS also offers excellent stability under load, and its final properties can be influenced by the conditions under which it is processed. For example, molding at high temperatures improves gloss and heat resistance, while molding at low temperatures results in higher impact resistance and strength.
ABS plastic is compatible with fused layer technology (FLT) and is available for most desktop 3D printers. It is a popular choice for 3D printing due to its low cost, strength, high stability, and versatility in post-processing. However, ABS tends to warp during the cooling process, and it requires high temperatures for molding to improve heat resistance. To reduce warping, printing inside an enclosure on a heated surface or using an adhesive to ensure the first layer adheres well to the print surface is recommended.
While ABS plastic is widely used, it has some limitations. It is susceptible to yellowing when exposed to UV light or excessive heat due to photo-oxidation of polymers. Additionally, ABS is flammable when exposed to high temperatures, such as those of a wood fire, and it will melt and boil, producing intense flames. Despite these drawbacks, ABS plastic remains a popular choice for 3D printing due to its toughness, flexibility, and impact resistance.
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Resin is durable and suitable for miniatures, but can be expensive
Resin is a suitable material for 3D printing miniatures, offering high levels of detail and translucency, with no layer lines. Resin miniatures are durable, able to withstand frequent handling without breaking, and can be smoother than FDM-printed objects. However, there are some drawbacks to using resin for 3D printing. Firstly, resin printing can be more expensive than FDM printing due to the higher cost of raw materials and the greater complexity of the manufacturing process. Resin printers also require additional ventilation and cleaning equipment, which adds to the upfront costs. Furthermore, clear resin prints can turn yellow over time when exposed to sunlight, although this can be prevented with protective coatings.
While FDM technology is more affordable, it may not always produce the desired level of detail for miniatures. FDM-printed objects are known for their visible layer lines, which can be minimised by using smaller layer heights, printing at higher temperatures, sanding the print, or using chemicals to smooth the surface. However, it is challenging to completely eliminate certain quality defects associated with FDM printers.
For beginners interested in resin printing, it is recommended to start with a smaller printer like the Mars 4. These smaller printers are cheaper than larger resin printers, which can cost over $800. It is also important to consider the additional costs of ventilation and cleaning equipment, which can add $50-200 to the overall setup cost.
When choosing a resin for 3D printing miniatures, it is important to select a durable resin that can withstand frequent handling. Budget resins tend to be more fragile and may not be suitable for miniatures. Siraya Tech Sculpt, for example, offers higher tensile strength compared to basic filaments like PLA or PETG.
In summary, resin is a durable and suitable material for 3D printing miniatures, offering superior quality and detail compared to FDM printing. However, the higher cost of resin and the additional equipment required can make resin printing more expensive overall.
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PET plastic is ideal for objects intended for food contact
When it comes to 3D printing miniatures, plastics such as polylactic acid (PLA) and resin are commonly used. However, one of the most frequently used plastics in 3D printing is Polyethylene terephthalate (PET), which is ideal for objects intended for food contact. Here's why:
PET plastic is widely recognised as a safe, non-toxic material for food and beverage packaging. It is approved by the FDA (Food and Drug Administration) and is also compliant with EU and NSF regulations. This approval is due to its chemical resistance and inert nature, ensuring that it does not leach harmful chemicals into food or beverages. It is also BPA-free, addressing potential health concerns associated with this chemical.
PET plastic is lightweight, making it easy to transport and handle, which translates to cost savings for both manufacturers and consumers. Its low weight also helps reduce carbon emissions during shipping, contributing to its environmental benefits. Additionally, PET is highly durable and shatterproof, making it a popular choice for beverage packaging and food containers.
The versatility of PET plastic is another advantage. It can be easily moulded into various shapes and sizes, accommodating everything from small bottles to larger bulk containers. This adaptability makes it suitable for packaging different types of food and beverages. Furthermore, PET plastic is highly recyclable and can be recycled repeatedly to produce new PET bottles, clothing, and carpet fibres, among other products.
Lastly, PET plastic is cost-effective for manufacturers. It offers competitive pricing, fast turnaround times, and customisation options such as bottle size, shape, colour, and labelling. These features allow manufacturers to create unique and attractive packaging while maintaining cost efficiency.
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Polyamides (nylon) are tough, inexpensive, and widely available
Polyamides, or nylon materials, are a group of polymers made up of repeating amide groups. They are synthetic or natural polymers that are known for their durability, toughness, and stretchable structure. Nylon, a type of polyamide, was given its trade name by the chemical company DuPont. It is an aliphatic polyamide with high tensile strength, making it a common choice for 3D printing. Nylon can be melted and formed using high heat in processes like injection moulding, extrusion, and 3D printing.
Nylon is a strong and versatile plastic that is widely used in 3D printing to create functional parts and prototypes. It has excellent mechanical properties, such as high impact and mechanical strength, and the ability to resist deformation or breakage under sudden loading. Nylon is also a good choice for electrical applications due to its electrical insulation and corrosion resistance properties.
The different types of nylons provide a wide range of properties. For example, Nylon 6 is known for its high-temperature resistance, toughness, and ability to withstand abrasions and chemicals. On the other hand, Nylon 6,9 has a high melting point and excellent insulation properties. Nylon 12, also called PA 12, is another strong and versatile nylon type that is popular for 3D printing.
Polyamides are available in fine, white powder format, which is used in Powder Bed Fusion technologies, and also in filaments used in fused deposition modelling (FDM). They offer durability, toughness, impact resistance, and flexibility due to their semi-crystalline structures. These characteristics make polyamides suitable for various applications, including robotics, aerospace, automotive, and medical sectors.
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Frequently asked questions
The best plastic for 3D printing miniatures depends on the type of printer you have. For FDM printers, PLA or PLA+ is a good option as it is easy to print with and can produce good detail when using a low layer height. For resin printers, standard resins are great for general printing, but can be brittle. ABS-like resin is a good choice for miniatures that need to be more durable and can withstand minor impacts.
FDM stands for Fused Deposition Modelling, also known as Material Extrusion. It is a type of 3D printing technology that uses plastic filaments to create prototypes.
PLA (Polylactic Acid) is a popular option for low-cost 3D printers as it is easier to print with than other plastics such as ABS. It is also biodegradable and has a lower cost.
