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Flexible 3D printing filaments are essential in modern product development.

From soft-touch consumer products to industrial components that need to absorb impact, more and more applications require materials that don’t just resist force, but adapt to it.

This is where TPU-based filaments come in.

They combine flexibility, durability, and long-term performance, making them ideal for parts that need to bend, compress, or withstand repeated stress without breaking.

But not all flexible filaments behave the same.

Choosing the right level of flexibility is key. Too soft, and your part won’t hold its shape. Too rigid, and it won’t perform as intended.

In this guide, we’ll explain how flexible 3D printing filaments work, what Shore hardness means, and how to choose the right TPU FLEX filament for your next application.

Flexible filaments, typically based on TPU (thermoplastic polyurethane), are designed for parts that need elasticity, impact resistance, and long-term durability.

Understanding Shore Hardness in TPU Filaments

Shore hardness describes how soft or rigid a flexible filament feels, but it's more than just a single scale.

Flexible materials are typically measured using two different Shore scales:

However, Shore hardness alone doesn't fully define performance. The actual behavior of a printed part also depends on:

A softer material can feel rigid in thick sections, while a harder material can still flex in thin geometries.

In practice: Shore hardness is a guideline for material selection, but the final part behavior is always a combination of material and design.

Introducing&nbsp;FLEX Semisoft: Maximum Flexibility and Softness

<a href="https://extrudr.com/en/at/products/flex-semisoft/">FLEX Semisoft</a> is built for applications where softness and stretch are required.

It can bend and compress repeatedly without tearing, making it ideal for:

👉 Best for: soft-touch, user-facing, and cushioning applications

Introducing&nbsp;FLEX Medium: Balanced Flexibility and Control

<a href="https://extrudr.com/en/at/products/flex-medium/">FLEX Medium</a> offers a balance between flexibility and structural integrity.

It maintains shape under load while still allowing movement.

👉 Best for: functional parts that require both movement and stability

Introducing FLEX Hard: Structural Strength with Controlled Flex

<a href="https://extrudr.com/en/at/products/flex-hard/">FLEX Hard</a> combines flexibility with mechanical strength and dimensional stability.

👉 Best for: semi-rigid, load-bearing and impact-resistant parts

Why Flexible Filaments Are Needed in Engineering and Design

Flexible materials are increasingly used across industries:

Rigid materials resist force.
Flexible materials absorb and distribute it.

That difference is critical in functional use cases.

How to Choose the Right Flexible Filament

1. How much flexibility do you need?

2. Does the part need to hold its shape?

3. Will it face mechanical stress or heat?

Printing Tips for TPU and Flexible Filaments

For best results, use our custom made Extrudr Material Profiles, which provide pre-tested settings for reliable printing .

Conclusion: Flexibility as a Functional Advantage

Flexible filaments are not just a niche material.

They enable new product designs, improve durability, and expand functional possibilities in 3D printing.

With the right TPU filament, you can design parts that don’t just withstand stress, but perform under it.&nbsp;

<a href="https://extrudr.com/en/at/collection/filament/?filters=material_type.QXR0cmlidXRlVmFsdWVHcm91cDozMQ%3D%3D">Learn more</a> about our FLEX range 3D printing filaments and choose the right one for your next print project.

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TPU Filament im 3D-Druck: Alles, was du über flexible Filamente wissen musst