Troubleshooting Common Issues When Printing PAHT-CF Filament with FDM Printers

Printing with PAHT-CF filament can yield high-strength, durable parts, but it also comes with its own set of challenges. Here, we’ll discuss common issues you might encounter and provide solutions to help you achieve optimal results.

If you have any additional tips or insights, please share them in the comments section below. Let's learn and improve together!

1. Warping

Issue: Warping occurs when the corners of the print lift from the bed, leading to a distorted part.


  • Bed Adhesion: Ensure the print bed is properly heated to 70-90°C. Use a PEI sheet or apply a PVP glue coating for better adhesion.
  • Enclosure: Enclose your printer to maintain a stable temperature and reduce drafts that cause uneven cooling.


2. Moisture Absorption

Issue: PAHT-CF filament is hygroscopic and absorbs moisture from the air, leading to print defects like oozing, bubbles, and rough surface finishes.


  • Storage: Store the filament in a dry box with relative humidity below 15%.
  • Drying: If the filament becomes damp, dry it in an oven at 80-100°C for 4-6 hours before printing.


3. Nozzle Clogging

Issue: Carbon fiber reinforcement can cause nozzles to clog due to its abrasive nature.


  • Nozzle Type: Use a hardened steel nozzle to withstand abrasion.
  • Temperature: Ensure the nozzle temperature is set between 300-320°C. Regularly inspect and clean the nozzle to prevent buildup.


4. Poor Layer Adhesion

Issue: Layers not bonding properly can lead to weak prints that delaminate easily.


  • Temperature Settings: Ensure the nozzle temperature is correctly set between 300-320°C and the bed temperature between 70-90°C.
  • Cooling Fans: Keep cooling fans OFF during printing to maintain optimal layer adhesion.
  • Bed Leveling: Ensure the print bed is level and the first layer adheres properly.


5. Surface Roughness

Issue: Prints may have a rough surface finish due to improper extrusion or filament moisture.


  • Print Speed: Reduce print speed and retraction settings to minimize oozing and stringing.
  • Dry Filament: Ensure the filament is dry to prevent moisture-related roughness.


6. Stringing and Oozing

Issue: Excessive filament strings or oozes during printing, affecting print quality.


  • Retraction Settings: Adjust retraction distance to 1-3mm and retraction speed to 1800-3600 mm/min.
  • Dry Filament: Ensure the filament is dry to reduce stringing.


7. Inconsistent Extrusion

Issue: The filament does not extrude evenly, resulting in an uneven print surface.


  • Extruder Maintenance: Check the extruder gears for wear and clean them if necessary.
  • Filament Quality: Ensure consistent filament diameter and inspect for tangles or snags.
  • Calibration: Calibrate the extruder steps to ensure accurate extrusion.


8. Overheating and Melting

Issue: Parts may overheat and deform during printing.


  • Temperature Control: Lower the nozzle temperature if overheating is observed.
  • Cooling: Ensure adequate cooling during pauses or layer changes to prevent localized overheating.

By following these troubleshooting tips, you can address common issues and achieve high-quality prints with PAHT-CF filament. With proper preparation and settings, you can make the most out of this high-performance material.

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