PrimePart® ST (PEBA 2301) for flexible, rubber like parts

A flexible rubber like material, demonstrating good chemical and water resistance, and long-term stability.


PEBA is our rubber like material, similar to TPU and other TPE’s, but slightly harder and stronger. With a higher melting point than most resin based elastomers, it is ideally suited to rugged end use applications. The material is water resistant, but not 100% waterproof, so will work for seals as long as they are not submerged for long periods of time.

Max print size: 180mm x 120mm x 120mm

Look & Feel

A finished PEBA part feels smooth in the hand with a soft touch granular texture on the surface.

Actual size: A. 50mm x 50mm x 16mm  |  B. 13.5mm x 13.5mm x 41mm | C. 102mm x 102mm x 40mm

Colour, Texture & Flex

The material comes in matt white and can range from a bright white to an ivory colour, with possible variation from part to part. It is a much more natural white than our Nylon parts. PEBA parts can be easily dyed to give them a much more uniform and far superior look to the natural finish.

Like other SLS parts, the surface finish has a grainy texture to it. Overall, the surface texture of a PEBA part is very consistent.

Similar to rubber, the parts are flexible but still quite rigid. Thin parts (1-2mm) are very flexible but as you go thicker (>= 5mm), parts have a functional rigidity.

Finishing options: Natural | Dyed Black

Laser-sintered parts made from PrimePart® ST (PEBA 2301) possess excellent material properties:

• Great flexibility for rubber like parts
• Cheaper than resin based alternative
• Best elastomer for batch production runs
• Speed of manufacture
• Higher melting point than resin based elastomers
• High elasticity, good for anti vibration

• Good for impact protection
• Good chemical resistance
• Excellent long-term stability
• High selectivity and detail resolution
• Water resistant
• Cushioning and damping

3DPRINTUK Top Tip: If you want the part to be flexible, a 2-3mm wall thickness is the best for this material. Thinner and it becomes too floppy, thicker and it can become too rigid, and even tear when flexed hard.


Typical applications ideally suited to PEBA are fully functional, flexible plastic parts of the highest quality. Due to its excellent mechanical properties, the material is often used as a production material for long-term use parts and components. The rubber-like fatigue behaviour qualifies Prime Part® ST (PEBA 2301) as an excellent prototyping and series production material. Other applications include some gaskets and seals.


• Difficult to remove powder from holes
• Not as accurate as PA2200 (+/- 0.5mm on overall XYZ dimensions)
• Natural colour not always consistent

• Flexibility can vary slightly
• Dye can be patchy
• Not good for high stretch applications

PEBA is not 100% waterproof so not ideal for seals that are submerged for long periods of time. Our test have shown that PEBA is not ideal for applications that require large amounts of stretching such as goggle straps, as the material can deform.

Very thick parts made from PEBA can become quite hard and it behaves more like a softer nylon than a rubber.

Larger square items can come out slightly asymmetric. The material is quite forgiving, however, so it can often stretch into symmetry around parts.

Technical data

Mechanical properties ValueUnit Test standard
Shore D hardness (15s)35-ISO 7619-1
3D Data ValueUnit Test Standard
Tensile ModulusISO 527-1/ -2
X Direction75MPa
Y Direction75MPa
Z Direction80MPa
Tensile StrengthISO 527-1/ -2
X Direction8MPa
Y Direction8MPa
Z Direction7MPa
Strain at breakISO 527-1/ -2
X Direction8%
Y Direction8%
Z Direction7%
Thermal properties ValueUnitTest Standard
Melting temperature, 10°C/min150°C ISO 11357-1/-3
Other properties ValueUnitTest standard
Density950kg/m³ISO 1183


Other materials

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