tpu filament
What is tpu?
TPU filament is made from thermoplastic polyurethane, a versatile plastic that combines the elasticity of rubber with the workability and durability of plastic. This unique synthesis gives it its characteristic properties: extreme flexibility, high wear resistance, and excellent resistance to chemicals and temperature changes. As a material created by bonding soft and hard segments at the molecular level, TPU offers an exceptional balance between mechanical strength and flexibility.
Why use tpu?
TPU filament is prized in 3D printing for its flexibility and durability, making it ideal for creating durable objects that can be stretched and bent without damage. These properties are perfect for products that are subject to mechanical stress, such as protective covers and seals. Its resistance to weather, oil and grease extends the areas of use to both industrial and outdoor use.
Nozzle
200-230 °C
Building plate
40-60 °C
Cooling fan
100%
Advantages TPU
- Flexible
- Long shelf life
- Durable and vibration dampening
Disadvantages TPU
- Cost
- Difficult to print with
- Can stick too tightly to the build plate
TPU 95A
When talking about “tensile strength limit ex95A”, this refers to the specific properties of the material in relation to its hardness and ability to resist deformation under tensile force. Let's break this down a bit:
Tensile strength: This is a measure of a material's ability to resist tensile forces without breaking. It is usually measured in megapascals (MPa) or pounds per square inch (psi). A material with high tensile strength can withstand greater forces without being deformed or broken.
Limit: In this context, it refers to the maximum tensile strength that TPU can achieve or withstand before it begins to permanently deform or break.
95A: This refers to the hardness of the TPU according to Shore A scale, a measurement of material hardness. The Shore A scale typically ranges from 20 to 100, with higher values indicating harder materials. A hardness of 95A is considered relatively hard for TPU and close to the limit of the Shore A scale, meaning the material is highly resistant to penetration and deformation but still retains some flexibility.
Common Problems with TPU Filament
Warping:
- Cause: Poor adhesion to the build plate. (first layer does not stick)
- Solution: Increase the build plate temperature, use a build plate specifically designed for TPU or apply an adhesion enhancer such as glue stick or blue masking tape. Additionally, fine tuning of the z-offset and print speed in the first layer may be necessary.
Stringing (Threading):
- Cause: Excess filament pulled between parts at travel transitions.
- Solution: Optimize the retraction settings by increasing the retraction length and speed and decreasing the write speed to control this problem.
Under-Extrusion:
- Cause: Too little filament is extruded, resulting in thin layers or gaps.
- Solution: KUse an extruder that can handle flexible materials, adjust the print speed and make sure the extruder does not squeeze the filament too hard. Also check that the nozzle is not blocked and that the temperature of the extruder is high enough.
Bridging (Bridges)
- Cause: The layers in the print hang down.
- Solution: Reduction of speed during bridging and use of support structures are necessary to achieve the desired result. Don't forget to use the cooling fans.
FAQ tpu filament
What can I do to get the TPU to stick?
To improve the adhesion of TPU filament, use a heated writing bed, apply a thin layer of hairspray or glue stick to the writing bed. Make sure the writing bed is clean and flat. Reducing the print speed can also help.
Does TPU Filament work with Bowden?
Not all 3D printer are suitable for printing. Printers with a Bowden extruder may have difficulty feeding flexible filament evenly due to the longer feed path. Direct drive extruders are recommended for best results
What are the recommended storage conditions for TPU?
To maintain TPU's physical properties and extend its life, it should be stored dry and away from direct sunlight. You should also be protected from extreme temperatures. The storage area should have a stable temperature and normal humidity to prevent the material from becoming brittle or deformed over time.
