FibreX PES+GF30


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FibreX™ PES+GF30 [Polyether Sulfone] is an ultra-performance 3D printing filament made using 30% glass fiber reinforced PES resin.  This material has excellent stiffness, strength, chemical resistance, dimensional stability – and it has higher thermal properties than Ultem™!

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FibreX™PES+GF30 3D Printing Filament

We formulated FibreX™ PES+GF30 specifically for 3D printing. We hand selected the fiberglass and PES base resin to assure the material prints well and offers optimal performance. This material prints best using a heated build chamber and we highly recommend the use of the Gearbox™ HT2 printer to assure the best layer bonding, strength, and dimensional stability. We see FibreX™ PES+GF30 as an excellent alternative to higher priced materials such as PEI and PEEK.

Gearbox HT2™ 3D Printer: Print industrial-grade parts using our PES+GF30 and more with the new Gearbox™ HT2 High-Temp 3D Printer.

Print Recommendations

Ext Temp 1

Extruder Temp

Bed Temp

Bed Temp

Chamber Temp

Heated Chamber

Nozzle Settings

Nozzle Specs
0.4mm diameter minimum
Hardened Steel Nozzle

Bed Adhesion

Bed Adhesion
Nano Polymer Adhesive

Layer Height

Layer Height
0.25mm or higher

Drying Filamen

Drying Specs
150°C for 4 hours

Break Away Support

ThermaX™ High Temp Support

Benefits of FibreX™ PES+GF30:

  • Exceptional strength and stiffness – even at elevated temperatures up to 220°C
  • High thermal properties: Tg:  220°C, HDT:  216°C [Higher than Ultem™!]
  • Inherently flame-retardant – polymer will not sustain ignition
  • Hydrolytic stability – resistant to steam and repeated autoclave sterilization
  • Amorphous – Excellent dimensional stability and low shrinkage

Filament Specifications:

1.75mm +/- 0.05mm in diameter

Recommended Print Settings:

  • Extruder: 370-390°C
  • Bed Temp: 140-160°C
  • Bed Prep: Nano Polymer Adhesive
  • Heated Chamber: Recommended up to 225°C [A high-temp heated chamber will provide the best environment for the lowest warp and optimal layer bonding. If your printer’s chamber can’t reach 225°C, then raise it as hot as possible to get the best results.]
  • Supports: ThermaX™ HTS High-Temp Support
  • Drying Instructions: 150°C for 4+ hours.

Abrasive Material

This material is particularly abrasive among 3D printing filaments. Users may find standard brass nozzles are chewed through very quickly compared to standard wear and tear. When worn through, the nozzle diameter will widen inconsistently and the printer will experience extrusion issues.

Use hardened steel nozzles with this filament to maximize toolhead life and quality of your prints!

Because of this, it's strongly recommended this material be printed through a hardened steel nozzle rather than a softer metal. Hardened steel nozzles can often be inexpensive and easily installed depending on your printer manufacturer's instructions.


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