TPE - TPU

What is a flexible filament (TPE/TPU)?

Flexible filaments, grouped under the term TPE (Thermoplastic Elastomer), are materials that combine the properties of rubber (flexibility, elasticity) with the ease of processing of plastic. TPU (Thermoplastic Polyurethane) is a specific type of TPE, very popular in 3D printing for its superior abrasion resistance and ease of printing compared with other TPEs.

These materials can be used to create parts that can be stretched, compressed and bent while retaining their original shape.

Understanding Shore Hardness: 88A, 95A, 98A

The main criterion for choosing a flexible filament is its hardness, measured on the "Shore A" scale. The lower the number, the softer the filament. The higher the number, the stiffer the filament.

 
• TPE 88A (Very Flexible): This is our most flexible filament. It resembles the texture of a shoe sole or watchband. It offers excellent elasticity but is the most demanding to print (requires a Direct Drive extruder and very low speed).

 

• TPU 95A (Semi-flexible): This is the industry standard. It offers a perfect balance between flexibility and ease of printing. Its rigidity is similar to that of a telephone shell. It is compatible with most printers, including some with a well-tuned Bowden extruder.

 

• TPU 98A (Rigid Hose): This is our most rigid hose. It approaches the hardness of a cart wheel or an industrial shock absorber. It prints almost as easily as PETG and is ideal for functional parts requiring shock absorption without excessive deformation.

Common applications by hardness

 
• TPE 88A: Seals, grips, soles, model tires.

 

• TPU 95A: Phone covers, protectors, flexible hinges, anti-vibration parts.

 

• TPU 98A: Wear parts, shock absorbers, wheels, chain guides, rigid but shock-resistant technical parts.

Printing tips: Successful flexible printing

Printing flexible filaments (especially the softer ones like 88A) is technical, as the filament can compress and jam in the extrusion system.

 
1. Extruder: A Direct Drive extruder is highly recommended, especially for the TPE 88A. A Bowden extruder will not work well with the softer types, but may be suitable for the 95A and 98A.

 

2. Print slowly: This is the golden rule. A slow speed (e.g. 20-40 mm/s) prevents the filament from compressing and clogging the nozzle.

 

3. Deactivate retraction: To prevent the filament from stretching and jamming, it's often best to deactivate (or set very low) retraction. You'll get more stringing, but fewer print failures.

 

4. Ensure a dry filament: TPE/TPU are highly hygroscopic (they absorb moisture). A damp filament will cause bubbles and a "foamy" appearance. Dry before use if necessary.

General technical data

 
• Available diameters: 1.75mm & (2.85mm on request - 10kg min)

 

• Extrusion temperature: 210-240°C (varies with hardness)

 

• Plateau temperature: 40-60°C

Quick comparison: Our range of hoses

Francofil's commitment to quality and French manufacturing

The manufacture of flexible filaments is a technical process that demands great precision. Our 100% French production, carried out in our workshop in Normandy, enables us to guarantee rigorous quality control on every spool. We ensure consistent diameter, essential for successful flexible printing, and material purity for reliable performance.