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S-Flex 85A?

Flexibility with very good impact strength and thermal insulation

Spectrum S-Flex 85A is a filament based on a thermoplastic polyether polyurethane. In the area of additive manufacturing, S-Flex 85A is a material characterized by a relatively easy and failure-free 3D printing process. An additional advantage that allows obtaining a perfect printout is very good adhesion of the first layer of the printed part to the working space, regardless of whether it is made of glass, steel, plastic or other material.

Low processing shrinkage and high flexibility significantly reduce the risk of the so-called curling up of the edges of manufactured parts. The distinguishing feature in the filament name 85A ? relates to the hardness of the material on the Shore scale and classifies Spectrum S-Flex 85A in the category of hard elastomers. This property from the point of view of the 3D printing process reduces the risk of filament deformation in the insertion system leading the the material to the printing head. This enables a slightly faster printing compared to other, more compliant elastomers.

Parts made of Spectrum S-Flex 85A are characterized by very high resistance to hydrolysis (a kind of degradation caused by the presence of water), good recyclability and very good resistance to dynamic forces. Thanks to these properties, it is possible to 3D print parts that protect surfaces exposed to impact (bumpers, sharp edge guards), sealing and protective elements with high chemical resistance, as well as thermal insulators.

Available diameters:
  • 1.75mm
  • 2.85mm
Available weights:
  • 250g
  • 500g
  • 1000g
  • 2000g

Technical data

Available diameter:
1.75 [mm]
Available weight:
250 / 500 [g]
Diameter tolerance:
+/- 0.05 [mm]
Shore hardness:
Verify your spool:
YES (course of diameter ? online graph - on the entire length of the spool, mean diameter, ovality, standard deviation individually for each manufactured spool)

How to use

Nozzle temperature:
Bed temperature:
Heated chamber:
not required
Active cooling fan:
Print speed:
20-70 mm/s

Material characteristics

  • high resistance to hydrolysis
  • up to 650% elongation at break
  • Shore-A hardness of 85
  • high tensile and tear resistance
  • low shrinkage
  • resistance to many common industrial oils and chemicals
  • reduced stringing while the printer is running idle


  • manufacturing of seals with a high chemical resistance
  • production of items, which has to be used as energy adsorbents
  • functional parts
  • all kinds of bumpers, vibration dampers
  • guides
  • protective cases
  • snap-fit parts
  • sleeves
  • hinges
  • bumpers and flexible spacers,
  • sealing parts with increased stiffness,
  • spring-damping elements for use in machine production and modeling,
  • flexible bands with high strength,
  • covers and housings for various devices,
Verify Your Spool

Check out our tool to verify purchased filaments.

Where to buy

Check the list of our local and online distributors.

Verify Your Spool

Check the course of diameter on the entire length of the spool, ovality, mean diameter and standard deviation for each manufactured spool individually.

Where to buy

Check the list of our local and online distributors.

A wide range of products

Wide portfolio consisting of over 50 filaments with a versatile range of properties and applications, divided into three segments: desktop easy-to-use, industrial grade and high performance.

High quality

Innovation, extrusion know-how and highest quality filaments are the pillars of Spectrum’s philosophy. Our team is working continously on the development of new materials and their applications.

European made

All filaments from our portfolio are in-house made. We use modern production lines equipped with non-standard solutions to obtain highest quality final product.

Professional technical support

Our qualified support team helps at every stage from material selection to the 3D printing process.

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