Carbon Fiber PEEK Filament

CarbonX™ Carbon Fiber PEEK 3D Printing Filament


CarbonX™ CFR-PEEK Carbon Fiber Reinforced PEEK 3D Filament 

CarbonX™ CFR-PEEK is one of the premier polymers in FFF/FDM 3D Printing.  Made using high-modulus carbon fiber for exceptional stiffness, strength, and dimensional stability.  

PEEK is one of the highest performance thermoplastics ever invented.  It is used in some of the most demanding applications such as seals, gears, bushings, bearings, and pump & compressor components.  Industries such as Auto, Aerospace, Defense, Semi-conductor, and Oil/Gas depend on PEEK for applications where failure is not an option.  

CarbonX™ PEEK Properties Include:

  • High Thermal Resistance 
  • Excellent Chemical Resistance
  • Superior Wear Resistance
  • Near Zero Moisture Absorption
  • Low smoke and toxic gas emissions

PEEK has an excellent resistance to hydrolysis in boiling water and superheated steam (sterilization/autoclavability) at temperatures in excess of 250°C (482°F).

General thermal properties of PEEK are:

  • Glass Transition Temperature (Tg) 143°C
  • Melt Temperature (Tm) 343°C
  • Continuous Use Temperature (CUT) 240 - 260°C

CarbonX™ CFR PEEK is carbon fiber reinforced and abrasive - resulting in high wear on a brass nozzles.  We recommend our A2 Hardened Steel Nozzles - HERE

Printing with CarbonX™ PEEK

PEEK has a melt temperature (Tm) of 343°C, therefore, you will need an all-metal extruder capable of reaching (and holding) temps upwards of 400°C or more depending on your specific printer.  Every printer / slicer is different and you will need to tinker a bit to find a process that works for you.  One of the more difficult aspects of printing with PEEK was getting it to stick to the build plate.  The best material we found was Ultem® PEI sheet or tape.

Here are our recommendations - which should act as a good starting point for you and your particular set-up.  

  • Extruder Temps:  380 - 410°C
  • Bed Temps:  130 - 150°C
  • Bed Prep:  Ultem® PEI tape or sheet
  • Nozzle Height:  Minimal distance between nozzle and build surface (press first layer almost directly into the build surface)
  • Extrusion Multiplier:  1.0
  • Extrusion Speed:  30 - 50 mm/s (slow and steady wins the day)
  • Carbon fiber filament is more abrasive than unfilled materials, so extended use will result in more wear on your nozzle.  
  • Warning:  PEEK has a tendency to stick to metal (PEEK loves metal).  So make sure to purge out your extruder before it cools down or you run the risk permanent clogs.  Seriously - we know this first hand.  

Annealing Printed Parts:  If needed, parts printed using PEEK may be annealed in a hot-air oven to reduce any printed-in stresses that may be present in the part.  Printed-in stresses may occur in any plastic and may result in lower than expected mechanical properties.  If this is an issue with your part, then you can follow the simple ramp up/down process for annealing the PEEK parts.

Step 1:  Place printed parts in cool, room-temp oven.
Step 2.  Set temp to 120°C and allow to stabilize for 30-60 min (longer if you have thick parts).  
Step 2:  After 1 hour at 120°C, increase oven temp to 140°C and allow to stabilize 1 additional hour.  
Step 3:  After 1 hour at 140°C, turn off oven heat and allow printed parts to return to room temp inside the oven as it cools.  

Since PEEK is a semi-crystalline polymer, it needs some time at or near it's Tg (143°C) to achieve it's full crystallinity.  Following this annealing process reduces / eliminates printed-in-stress and allows the part to fully crystallize, giving you the full properties of PEEK.