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Ultimaker: What are flexible filaments and which one should you choose?

  • Writer: BuildVolume Admin Team
    BuildVolume Admin Team
  • May 26, 2020
  • 3 min read


Flexible 3D printing filaments open up a lot of possibilities for designers and engineers. Complex elastic forms can be produced easily in-house, then used in a variety of different ways – from prototyping flexible features to creating custom tools.


However, for novice 3D printer users, printing with TPU and other flexible materials can seem daunting, as they’re not as easy to use as some others.


What are flexible filaments?

Flexible filaments are materials with a blend of rigid plastic and rubber properties. This mix is called a thermoplastic elastomer (TPE). Thermoplastic elastomers behave in a similar way to rubber, and can be stretched and twisted to a large extent without breaking.


There are a variety of different flexible filaments available, and some are more elastic than others. The most commonly used is thermoplastic polyurethane (TPU).


Flexible filaments pros and cons

Flexible 3D printing filament offers some big benefits for users, such as:

  • Great elasticity. If you need a filament that can be stretched, maneuvered and bent, this is the ideal choice

  • Impact resistance. Even significant impact doesn’t usually deform products printed from flexible filaments

  • Less vibration. Rubber-like material dampens vibrations, which can be useful in parts for mechanical or industrial applications

However, there are a few drawbacks, like:

  • More difficult to print. If you are used to printing with PLA, you will need to get used to the different characteristics of flexible filaments like TPU. Stringing can occur, which makes it less suitable for aesthetic prints. Bridging overhangs can also be difficult

  • Post-processing. TPU generally offers fewer post-processing options for your finished print



Common applications of flexible filaments

There are several ways in which materials like TPU can be used.

  • Functional prototyping and fit testing. Designers creating products or parts with elastic properties can test functionality with true-to-life flexibility – for example a phone case or seal

  • Custom tooling. Flexible filaments enable the creation of tools with ductile elements, such as handles or gripper parts

  • End-use parts. Rubber-like properties are ideal for many usable or spare parts. In particular, materials like TPU can offer softer contact points to avoid machinery damaging goods on production lines


Common industries using flexible filaments

As the number of 3D printing material types grows, flexible filaments are becoming increasingly popular across a range of industries.


In the automotive industry, vehicle panels and wheels often have to withstand impact during assembly, but any damage can cause expensive scrap costs. Using flexible materials reduces the risk of scratching vehicle parts when using 3D printed custom tooling, which can be made more quickly and at lower cost.




In consumer goods, there is a similar need on product packaging lines. The blue spare parts below are 3D printed in TPU 95A by Heineken at their Seville brewery, and help to direct packs of beer bottles on a conveyor belt.


3D printed spare parts (printed in blue) direct products delicately


And in product and industrial design, flexible filaments can be used to test many prototypes, from bike handles to machine components.


Hardware requirements

With so many TPU and TPE filaments available, requirements will differ between filaments. On Ultimaker 3D printers, our TPU 95A is supported on the Ultimaker 2+, Ultimaker 3, and all S-line models.


When printing with Ultimaker TPU 95A, you’ll need the following hardware requirements:

  • Temperature. The build plate should be either unheated or up to 70 °C and nozzle temperature between 220 and 235 °C

  • Cooling fan. You’ll also need a part cooling fan in your 3D printer to get the best possible results

  • Adhesion method. In most instances, extra adhesion is not necessary for a successful print, but we always advise applying a thin layer of glue or Magigoo Flex to your glass build plate

An enclosure isn’t required for flexible 3D printing filaments but can aid the printing environment by making it more stable.


Choosing your flexible filaments type

There’s a range of flexible filaments to choose from. Here’s an outline of the materials that Ultimaker offer, or filaments that can be easily printed on Ultimaker 3D printers thanks to predefined print profiles.







 
 
 

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