Flexfill TPE 90A is a popular thermoplastic elastomer filament known for its unique balance of flexibility and hardness, making it ideal for durable yet flexible 3D printed parts. This article explores what flexfill tpe 90a is, its key mechanical properties, and why it stands out among flexible filament materials for a wide range of applications.
Whether you’re creating grips, seals, wearable parts, or functional prototypes, understanding the technical aspects and best printing practices for flexfill tpe 90a will help you optimize your 3D prints for performance and durability.
What Is Flexfill TPE 90A?
Flexfill TPE 90A is a type of thermoplastic elastomer (TPE), a versatile class of polymers that combine the elasticity of rubber with the processing advantages of thermoplastics. The “90A” rating refers to the filament’s Shore hardness, a scale used to measure the hardness of flexible materials. In this case, a Shore 90A hardness means the material is firmer than softer TPE grades, yet retains a good level of flexibility.
Manufactured by specialists like Farr Polychem, Flexfill 90A TPE compounds are engineered for specific mechanical performance and chemical resistance. This makes them an excellent choice for technically demanding applications where both flexibility and durability are crucial.
Key Mechanical Properties of Flexfill 90A TPE
Understanding the mechanical properties of Flexfill TPE 90A helps in selecting it for the right applications. Below are some essential features of this filament:
- Shore Hardness 90A: This gives the filament a relatively firm but flexible quality, balancing rigidity with elastomeric stretch.
- Tensile Strength: High enough to produce resilient parts that resist tearing and wear under stress.
- Elongation at Break: Moderate flexibility allows the material to stretch without fracturing, ideal for parts that require repeated bending or impact resistance.
- Chemical Resistance: Good resistance to oils, greases, and some solvents, protecting parts in harsh environments.
- Thermal Stability: Maintains flexibility under moderate heat exposure, important for wearable and outdoor applications.
Why Choose Flexfill TPE 90A for 3D Printing?
Compared to softer TPE filaments (such as those rated Shore 70A or 80A), Flexfill 90A offers enhanced durability and more dimensional stability. This makes it particularly useful when printing parts that need to hold their shape under load while still providing a comfortable degree of flexibility.
Its combination of strength, wear resistance, and elasticity suits applications like ergonomic grips, flexible seals, gaskets, and even custom wearable devices. The firmer feel reduces deformation over time, improving product lifespan.
Additionally, Flexfill 90A TPE exhibits good layer adhesion and standard extrusion behavior, allowing for smooth printing with minimal warping or stringing.
Optimal Print Settings for Flexfill TPE 90A
Getting the best results from your Flexfill 90A TPE filament involves fine-tuning print parameters tailored to its mechanical characteristics:
Print Speed
Lower print speeds (around 20-30 mm/s) help reduce filament stretching and ensure better layer bonding. Higher speeds can cause reduced inter-layer adhesion and stringing due to TPE’s flexibility.
Bed Adhesion
A heated bed set to about 40-60°C is recommended. Use blue painter’s tape, PEI sheets, or a thin layer of glue stick to enhance adhesion. Flexible filaments like Flexfill 90A can sometimes warp; ensuring strong bed adhesion prevents print failures.
Nozzle Temperature
Typically printed between 220°C and 250°C, this range depends on the particular TPE compound. Adjusting the temperature within this window can affect surface finish and stringing.
Retraction Settings
Minimal retraction is advised to avoid filament jams with flexible materials. Retraction distances between 1-3 mm and reduced retraction speeds can help maintain smooth extrusion.
Cooling
Moderate part cooling can improve bridging and detail but avoid full cooling that causes layer separation in flexible parts. Setting the fan speed to about 30-50% is typical.
Ideal Applications for Flexfill 90A TPE
Flexfill 90A excels in applications requiring a balance of durability and flexibility. Some popular uses include:
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Ergonomic grips for tools, sporting equipment, or handheld devices.
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Flexible seals and gaskets that must withstand mechanical stress and chemical exposure.
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Wearable components such as wristbands, custom orthotics, and protective gear.
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Creatures, toys, and flexible mechanical parts for prototypes and functional models.
Comparing Flexfill TPE 90A with Softer TPE Grades
While softer TPE filaments (such as Shore 70A TPE) offer extreme flexibility and rubber-like softness, they may lack the strength and shape retention required for some engineering applications.
Flexfill 90A offers a middle ground—it is less squishy but significantly more resilient and easier to print without excessive filament deformation or stringing. Softer TPEs often need slower prints, dedicated printer setups, or specialized extruders to handle their highly elastic nature.
Choosing between flexfill tpe 90a and softer grades depends on your project’s performance demands—if you prioritize durability and moderate flexibility, 90A is the superior choice, especially for functional, long-lasting parts.
How Farr Supports High-Quality Flexfill 90A TPE Compounds
Farr Polychem is a trusted manufacturer specializing in custom-engineered TPE compounds, including Flexfill 90A formulations designed to meet precise industrial requirements. Their expert knowledge in polymer science ensures that each batch of Flexfill 90A TPE balances flexibility, toughness, and print reliability.
By partnering with Farr, 3D printing professionals and product developers gain access to tailored filament grades that optimize both performance and manufacturability, backed by stringent quality control and technical support.
If you’re looking to develop innovative flexible parts or improve existing designs, Farr’s custom TPE solutions offer significant advantages in material consistency, mechanical properties, and processing ease.
Conclusion and Final Recommendations
Flexfill TPE 90A is a versatile, durable, and flexible 3D printing filament that strikes a practical balance between softness and strength. Its Shore 90A hardness, combined with good chemical resistance and thermal stability, makes it suitable for a wide range of functional applications including grips, seals, and wearable parts.
When printing with Flexfill 90A, optimize your settings by using lower print speeds, moderate bed temperatures with strong adhesion techniques, cautious retraction, and balanced cooling. These steps help minimize common issues like stringing and layer delamination.
Compared to softer TPE grades, Flexfill 90A delivers enhanced shape retention and mechanical strength, making it the preferred choice for parts that demand reliability in real-world use.
For best results and custom compound solutions, consider working with experienced suppliers like Farr Polychem who specialize in advanced TPE filaments tailored to your needs.
Frequently Asked Questions
Shore 90A hardness refers to the filament’s firmness on the Shore A scale, which measures flexible material hardness. A rating of 90A indicates the material is firm yet still flexible, offering a balance of elastomeric stretch and structural rigidity ideal for durable, flexible parts.
Use slower print speeds (20-30 mm/s), set your heated bed between 40-60°C with a suitable adhesive like painter’s tape or glue stick, and print at nozzle temperatures of 220-250°C. Minimize filament retraction to avoid jams, and use moderate cooling. These settings help achieve optimal print quality and adhesion.
Flexfill 90A TPE is widely used for ergonomic grips, flexible seals and gaskets, wearable devices such as custom orthotics and wristbands, and functional prototypes requiring toughness with flexibility. Its balance of hardness and elasticity suits these versatile applications well.