In the world of 3D printing, flexible filaments have gained significant popularity for their ability to create objects that require elasticity and durability. Among the most widely used flexible materials are PLA flexible and TPU. Both are commonly used for various applications, but their characteristics and performance differ in several ways. Understanding how PLA flexible compares to TPU and other flexible filaments will help you make an informed decision about which material to use for your 3D printing projects.
What is PLA Flexible?
PLA (Polylactic Acid) flexible filament is a more elastic version of the standard PLA filament. PLA itself is already known for its ease of use, low odor, and environmentally friendly nature since it’s derived from renewable resources like cornstarch. However, PLA flexible, also known as soft PLA filament, is designed to have increased flexibility, making it ideal for printing parts that need to bend, stretch, or withstand wear and tear without breaking. Soft PLA filament offers an attractive balance between the rigidity of traditional PLA and the flexibility needed for complex, moving parts.
What is TPU?
TPU (Thermoplastic Polyurethane) is another highly flexible filament used in 3D printing. Known for its excellent durability, resilience, and abrasion resistance, TPU is often chosen for applications that require high elasticity, such as phone cases, belts, and gaskets. TPU filaments are available in various hardness levels, often denoted as Shore A ratings. These ratings determine how soft or rigid the material is, with lower numbers corresponding to softer filaments.
Key Comparisons: PLA Flexible vs. TPU
- Flexibility and Elasticity
PLA flexible and TPU are both considered flexible materials, but TPU tends to be more elastic. TPU filaments have higher resilience, which means they return to their original shape more easily after being stretched or deformed. This makes TPU ideal for applications that require significant bending or stretching without losing shape. On the other hand, PLA flexible, while still elastic, tends to have slightly less stretchiness compared to TPU, making it a better option for parts that don’t require extreme flexibility. - Ease of Printing
One of the reasons PLA is so popular among beginners is its ease of use. PLA flexible, like regular PLA, is easy to print with and does not require a heated bed, although it may benefit from one. PLA flexible also exhibits minimal warping during the printing process, making it a reliable choice for many users. TPU, on the other hand, can be more challenging to print with. It has a tendency to warp and may require a slower print speed to prevent issues such as stringing or under-extrusion. It also requires precise control of the extrusion rate, which might be tricky for new users. - Durability and Strength
When it comes to strength, TPU generally outperforms PLA flexible. TPU’s superior abrasion resistance and toughness make it the go-to choice for parts that will undergo significant wear, such as tires, footwear, and protective covers. PLA flexible is more suitable for parts that need to have a balance between durability and flexibility, such as toys, figurines, and simple mechanical parts. It is still relatively durable but not as tough as TPU, particularly when exposed to high levels of stress. - Environmental Impact
When you buy flexible soft PLA it holds an advantage over TPU in terms of sustainability. PLA is biodegradable, made from renewable plant-based resources, and can be composted under the right conditions. On the other hand, TPU is a petroleum-based material and is not biodegradable. Therefore, if environmental impact is a key consideration, PLA flexible may be the better choice for eco-conscious users. - Surface Finish and Aesthetics
When it comes to surface finish, PLA flexible often yields smoother and shinier prints compared to TPU. This makes it an excellent choice for printing aesthetic objects that require a polished appearance. TPU, being more rubber-like, generally results in a matte finish and has a more flexible feel, which may be preferable for certain functional applications.
Conclusion
In summary, both PLA flexible and TPU offer unique benefits that cater to different 3D printing needs. PLA flexible is ideal for beginners and environmentally conscious users looking for a more sustainable and easier-to-use filament with moderate flexibility. TPU, on the other hand, excels in durability, resilience, and elasticity, making it perfect for applications that require significant stretch and wear resistance. When considering 3D printing filament price, PLA flexible often comes at a more affordable rate compared to TPU, making it a budget-friendly option for many users.
