Hot End Replacement Lulzbot Taz 3D Printer

How to replace the hot end on your Lulzbot Taz 3D printer

 

At Print Your Mind, we are dedicated to providing the best possible support and assistance to our customers. 3D printers require occasional maintenace and up-keep, so this tutorial will assist you when it comes time to replace the hot end on your Taz printer.

 

Benefits of this upgrade:

  • replace a broken or failing hot end
  • achieve higher quality prints by returning your extruder to all of it's former, factory-fresh, glory


Requirements for the upgrade:

     Purchased parts:

      Lulzbot Taz Hexagon Hot End

        Tools and hardware:

          • allen wrenches or hex keys (H1.5, H2.5, H3.0)
          • dental pick (or other fine-tipped tool)
          • cable ties
          • scissors or cable snips

        Lulzbot Taz Hexagon Hot End Tools

         

         Detailed steps:
        1. Unplug your printer's power cable from the wall. Safety first!

        2. Open the parts kit and lay out the parts. We will be using the pre-wired harness and reusing the existing mounting plate, so we will keep the extra plate and separate wires as spares.

        Lulzbot Taz Hexagon Hot End Replacement Parts

        3. Disconnecting the wire harness for the hot end by separating the two halves.
        lulzbot taz printer wire harness

        4. Remove the top mounting screw using a 2.5mm hex key.
        Lulzbot Taz Hexagon Hot End Remove Top Mounting Screw

        5. You can now lift the hot end up and away from the X-carriage.
        Lulzbot Taz Hexagon Hot End Lift off X CarriageLulzbot Taz Hexagon Hotend Removed

        6. Remove the zip tie(s) holding the cable wrap in order to expose and separate the wires.
        Lulzbot Taz Hexagon Hot End Snip Zip Ties
        Lulzbot Taz Hexagon Hot End

        7.  Next remove the front extruder fan using a 2.5mm hex key.
        Lulzbot Taz Hexagon Hot End Front Extruder Fan

        8. Remove the right side cooling fan using the 2.5mm hex key, and then remove then fan duct underneath the fan using a 1.5mm hex key.
        Lulzbot Taz Hexagon Hot End Right Cooling Fan
        Lulzbot Taz Hexagon Hot End Right Cooling Fan Duct

        9. Repeat the same for the left side cooling fan and duct,
        Lulzbot Taz Hexagon Hot End Left Cooling FanLulzbot Taz Hexagon Hot End Left Cooling Fan Duct

        10. With the fans and ducts out of the way, remove the two screws holding the mounting plate to the extruder housing.
        Lulzbot Taz Hexagon Hot End Mounting Plate

        11. Snip the zip tie holding the fan wire, being careful not to catch the wire itself.
        Lulzbot Taz Hexagon Hot End Fan Wire Zip Tie

        12. Disconnect the cable to the stepper motor.
        Lulzbot Taz Hexagon Hot End Disconnect Stepper Motor

        13. You should now have a de-constructed hot end. :)
        Lulzbot Taz Hexagon Hot End Disassembled

        14. Remove the screw holding the ground wire to the heating block. If the screw is stuck in old melted plastic, a heat gun may be needed to soften the plastic and allow the removal of the screw. Be careful not to damage the wire or the connection terminal at the end of the wire.
        Lulzbot Taz Hexagon Hot End Remove Ground Wire

        15. Remove the fan wires from the harness using the dental pick that came with your printer (or other such pointed object). The fan wires are the right-most ones when looking at the side of the harness with the Lulzbot triangle.
        Lulzbot Taz Hexagon Hot End Remove Fan Wires
        Lulzbot Taz Hexagon Hot End Remove Fan Wires

        16. Next, repeat the procedure to remove the heater wires (3rd from the left of the harness).
        Lulzbot Taz Hexagon Hot End Remove Heater Wires
        Lulzbot Taz Hexagon Hot End Removed

        17. Similarly, remove the 4 wires from the new hot end's wire harness.
        Lulzbot Taz Hexagon Hot End Remove Wire Hareness
        Lulzbot Taz Hexagon Hot End Removed From Wire Harness

        18. To start the reassembly, install the ground wire into the top screw hole of the new heater block.
        Lulzbot Taz Hexagon Hot End Install Ground Wire

        19. Before inserting the wires from the new hot end into the existing wire harness, ensure that the small flap is raised. If was flattened during the removal from the new wire harness, gently pry it back up so that it will "lock" in place in the wire harness.
        Lulzbot Taz Hexagon Hot End Raise Tab on Wire

        20. Insert the heater wires into the holes that are 3rd from the left of the harness when looking at the side with the Lulzbot triangle (polarity doesn't matter). Follow this with inserting the fan wires in the right-most holes of the harness (black on the bottom, red on top).
        Lulzbot Taz Hexagon Hot End Insert Heater Wires
        Lulzbot Taz Hexagon Hot End Insert Fan Wires
        Lulzbot Taz Hexagon Hot End Rewired

        21. Prepare the extruder assembly by inserting a length of filament so that at least an inch is exposed at the lower end. This will serve to align the hot end with the filament path.
        Lulzbot Taz Hexagon Hot End Filament Allignment

        22. Using the exposed filament, slide the new hot end up into place under the extruder assembly using the mounting plate (either the new one from the kit, or the old one if it's not damaged). Secure it in place using the 3.5mm hex screws.
        Lulzbot Taz Hexagon Hot End Attach to Extruder

        23. Place the cable wrap around the wires, and secure with zip ties.
        Lulzbot Taz Hexagon Hot End Cable Wrap

        24. Reattach the stepper wire to the motor. The connector is keyed so that it will only fit one way.
        Lulzbot Taz Hexagon Hot End Attach Stepper Motor Wire

        25. Reattach the center cooling fan.
        Lulzbot Taz Hexagon Hot End Center Fan

        26. Secure the left side fan wire under the assembly using a zip tie.
        Lulzbot Taz Hexagon Hot End Left Fan Zip Tie

        27. Find the side fan shroud with the X axis end stop attached to it. Mount this to the right side of the extruder assembly, followed by the cooling fan that wasn't zip tied to the bottom of the assembly.
        Lulzbot Taz Hexagon Hot End Fan Shroud with End Stop
        Lulzbot Taz Hexagon Hot End Right Fan Shroud
        Lulzbot Taz Hexagon Hot End Right Fan

        28. Repeat the procedure for the left fan shroud and cooling fan.
        Lulzbot Taz Hexagon Hot End Left Fan Shroud
        Lulzbot Taz Hexagon Hot End Left Fan

        29. You now have a fully assembled new hot end.
        Lulzbot Taz Hexagon Hot End Fully Assembled


        30. Mount the hot end back on the printer by lowering the assembly on the lower mount of the X carriage and secure with the screw through the top mounting hole.
        Lulzbot Taz Hexagon Hot End Remove Top Mounting Screw

         

        Enjoy your new hot end, and happy printing!

         


        This guide is licensed CC BY-SA 4.0 International. LulzBot® is a 
        registered trademark of Aleph Objects, Inc.

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