Ribbon Cable Replacement (Desktop)



  • 2mm hex key
  • Phillips #1 screwdriver
  • Painter’s tape (or similar tape that will not leave residue on the printer)
  • Tape measure


Replacing the ribbon cable is a lengthy, delicate procedure. When removing the ribbon cable from your printer, it is important to prevent any other wires from being damaged. This process requires small movements and can lead to damage to your printer if care is not taken. Be sure to turn your printer off before doing any work with your ribbon cable.

Take a moment to read over this section in its entirety before beginning the procedure.

Markforged products contain high voltage and other hazards. Do not remove any panels or protective guards without appropriate technical training and experience necessary to minimize the risks to yourself and others. If you do not feel comfortable accessing service areas of your Markforged product, please contact your Reseller.

Remove the Ribbon Cable

Note: Take care not to discard any hardware you remove during this procedure, as you will need it during the reinstallation.

  1. Completely unload print material. For more information, see Unload Plastic and Unload Fiber, if applicable.
  2. Power off and unplug the printer.
  3. Remove and set aside the print bed and any fiber spools.
  4. Remove and set aside the Wi-Fi antenna / Ethernet cable.
  5. Disconnect the feed tube from the plastic extruder. Remove it from the printer and set it aside.
  6. Tape the lid and visor of the printer closed to prevent them from accidentally opening.
  7. Ensure that the printer is placed on a flat, stable surface that has enough room to move the printer if necessary.
  8. Turn the printer upside down so that the bottom plate is facing up.
  9. Using the Phillips screwdriver, remove the ten screws from the bottom plate and set them aside.
  10. Remove the bottom plate and set it aside.
  11. Using the 2mm hex key, remove the four screws and the corresponding lock washers and set them aside.

  12. Remove the fan screen and and set it aside.
  13. With the printer still upside down, use a 2mm hex key to loosen the 14 screws (indicated below) from the back plate of the printer.

  14. Untape the visor.
  15. Tilt the printer backward such that the visor can be opened wide enough for you or a partner to reach into the print chamber. Move the wire cover up and away from the top of the printer to loosen it. (In the image below, the arrow points toward the bottom of the printer, facing up during this procedure.)

  16. Find the spot where the ribbon cable adheres to the back wall of the printer and peel the cable free of the adhesive.
    Note: Leave the adhesive on the printer, if possible. You will need it when installing the new cable.
  17. Disconnect the ribbon cable from the motherboard. Note that the cable is mounted beneath the board.


  18. Push the back plate away from the printer to create a gap wide enough to pass the ribbon cable through.

  19. Slide the ribbon cable through the new gap toward the opening for the fan.

  20. Feed the ribbon cable through the fan opening into the printer.
  21. Slide the cable clip away from the print head, then gently squeeze the tabs on the ribbon cable connector to disconnect the ribbon cable from the print head.


  22. Remove the ribbon cable from the printer.

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Install the New Ribbon Cable

  1. Using the old cable as a reference, bend the new cable in exactly the position along the length of the cable.
  2. Slide the new ribbon cable between the cable cover and back plate so that it sits where the old cable sat.

  3. Attach the new cable to the back wall of the printer, using the adhesive left over from the old cable.
  4. Slide the cable cover back into place in the printer.

  5. Insert the clip on the new ribbon cable into the port on the bottom of the motherboard.


  6. Replace the fan screen, as well as the four bolts that hold it in place.

  7. Ensure that all parts of the printer are properly aligned and replace the fourteen screws from the back plate.

  8. Replace the bottom plate of the printer and the ten screws that hold it in place.

  9. Tape the visor closed to prevent it from accidentally opening.
  10. Turn your printer over onto its bottom plate and ensure that it is placed in its operating location.
  11. Remove and discard the tape holding the lid and visor shut.
  12. Reinsert the ribbon cable into its connector on the print head until both tabs snap into place, then slide the cable clip back onto its bracket.
    Note: Be careful not to break the cable, clip, or board. Ensure that the cable is secure. The clip will keep the cable from dragging on parts or becoming damaged.

  13. Reinstall the print bed.
  14. Reinstall the Wi-Fi antenna / Ethernet cable.
  15. Reconnect the plastic feed tube to the plastic extruder.
  16. Plug your printer in and power it on.
  17. Reload print material. For more information, see Load Plastic and Load Fiber, if applicable.

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