Introduction: What is TPU Filament?

Thermoplastic Polyurethane (TPU) filament is a flexible, durable material widely used in 3D printing. It combines the elasticity of rubber with the strength of thermoplastics, allowing creators to build stretchable, wear-resistant components. Among the various brands producing TPU, eSUN3D stands out for its quality, consistency, and printability, making it a preferred choice for professionals and hobbyists alike.

Key Features of eSUN TPU Filament

1. Optimal Shore Hardness (95A)

eSUN TPU filament offers a balanced shore hardness of 95A, making it flexible enough to bend without breaking, yet rigid enough to hold form. This makes it suitable for parts that must absorb stress or stretch repeatedly—like gaskets, phone cases, or protective gear.

2. High Elasticity and Durability

One of the strongest selling points of eSUN TPU is its elongation at break of over 500%. It can be stretched significantly without tearing, giving designers the freedom to build highly functional prototypes and finished products.

3. Consistent Diameter and Tolerance

eSUN maintains a diameter tolerance of ±0.03 mm, ensuring smooth extrusion and reducing the chances of clogging. The filament’s dimensional accuracy translates into reliable, high-resolution prints with excellent layer adhesion.

Technical Specifications

• Shore Hardness: 95A

• Print Temperature: 220°C – 250°C

• Bed Temperature: 60°C – 80°C

• Print Speed: 20 – 40 mm/s

• Diameter: 1.75mm

• Tolerance: ±0.03mm

These settings provide a good starting point and can be adjusted based on specific printer models and print designs.

Advantages of Using eSUN TPU

1. Compatibility with a Range of Printers

Unlike some flexible filaments that require specialized setups, eSUN TPU is relatively user-friendly. It works well on most 3D printers with direct drive extruders and even on some Bowden setups with proper tuning.

2. Low Warping and Excellent Layer Adhesion

Thanks to its stable material composition, eSUN TPU resists warping and curling during prints. The filament lays down consistently and sticks well to heated beds—particularly those coated with PEI or glue stick.

3. Affordable and Accessible

Compared to other premium TPU filaments on the market, eSUN offers a competitive price without compromising quality. It's available globally through eSUN’s distributors and online marketplaces like Amazon and AliExpress.

Common Applications

• Wearable tech: Bands, insoles, gloves

• Automotive parts: Seals, grommets, flexible mounts

• Consumer goods: Phone cases, toys, grips

• Medical prototypes: Braces, test molds

• Engineering tools: Vibration dampeners, hinges

eSUN TPU performs reliably in both functional and aesthetic roles, making it versatile across industries.

Tips for Successful Printing

• Use low speeds (20–30 mm/s) to prevent filament jamming.

• Enable minimal retraction to reduce stringing but avoid clogs.

• Keep it dry: TPU absorbs moisture easily, which can affect print quality. Store the filament in airtight containers with silica gel.

• Use a flexible build plate or apply glue stick for easy removal.

Conclusion

eSUN TPU filament is an excellent entry point into the world of flexible 3D printing. With its combination of elasticity, strength, and print reliability, it enables a wide range of creative and functional applications. Whether you're a designer, engineer, or hobbyist, eSUN TPU offers the quality and value to bring your flexible projects to life.