CFF Fiber Nozzle Replacement (and How to Correct a Nozzle Jam)


Note: Legacy documentation is no longer being updated. For up to date instructions, see our Desktop Series support articles.


Note: You must perform a bed leveling routine and the fiber nozzle height adjustment after removing or replacing a fiber nozzle.


WARNING: You must apply the provided Anti Seize lubricant to the nozzles everytime they are removed and reinstalled. Example below.


In the event that you experience a damaged fiber nozzle or a fiber nozzle jam, replacement of the fiber nozzle and the fiber nozzle tube may be required.

  1. Make sure that the print heads are cooled to less than 40C.

    The picture below clearly shows that fiber (carbon fiber in this example) remains inside the Fiber Bowden Tube when the printer is inactive; often an indication of a fiber nozzle jam.

  2. With the print head cooled down, unscrew the Fiber Bowden Tube adapter from the print head.

    Below we can see that the carbon fiber remains stuck inside the print head as we extract the adapter tube.

  3. If the fiber filament will not pull freely from the print head, cut the carbon fiber as shown below with a pair of wire cutters or scissors.

  4. Try to gently pull the excess fiber filament from the Fiber Bowden Tube.  If the fiber does not pull freely from the tube, do not force it - otherwise, the fiber can break inside the Fiber Bowden Tube, making it difficult to remove any trapped fragments.  If the fiber pulls freely from the tube, skip to step 6.

  5. If the fiber filament does not pull freely from the Fiber Bowden Tube, you will need to actuate the fiber cutter (the cutter inside the fiber extruder).  Using the LCD touch screen, select "Utilities" > "Actuate Fiber Cutter" > "NEXT"

    Once cut, pull the excess fiber from the Fiber Bowden Tube, as shown below.

  6. Using the provided 10mm nut driver, carefully unscrew and remove the fiber nozzle.

    Below we can see an example of a fiber jam - often the result of a fiber nozzle which was/is too close to the build bed.  To help avoid this, please perform both a bed leveling routine using the new 100um shim, and a fiber nozzle height adjustment using the 130um shim after removing and replacing a fiber nozzle.

    Generally, the disposable plastic nozzle tube should come out with the nozzle, as shown below.  If it does not, use the nozzle reamer from the accessory kit to push the plastic nozzle tube out of the bottom of the print head by pushing the reamer through the fiber channel hole at the top.

  7. Install a new PTFE nozzle tube into a new nozzle, making sure that it is inserted all the way.

  8. Apply a small dot of the provided Anti-Seize compound to the threads of the replacement fiber nozzle.

  9. Thread the new fiber nozzle into the print head; screw it in to finger-tightness, unscrew it, then screw it back in to finger-tightness again; this will evenly distribute the applied Anti-Seize compound on the nozzle threads.

  10. Using the 10mm nut driver, tighten the nozzle until it firmly bottoms out on the heater block.

  11. Replace the Fiber Bowden Tube Adapter.

  12. Run the Load Fiber routine from the printer LCD touch screen.