Project Dashboard Accessories and Upgrades LulzBot TAZ Dual Extruder Tool Head v2 Installation LulzBot TAZ 6 Workflow

1 Getting Started

You just upgraded your LulzBot® desktop 3D printer with the LulzBot TAZ Dual Extruder Tool Head v2. After following this Quick Start Guide, your LulzBot TAZ 3D printer will be more capable than ever.

Let's get started!

LulzBot TAZ Dual Extruder v2 Tool Head
LulzBot TAZ Dual Extruder v2 Tool Head

2 Included materials

Included Materials

  • LulzBot TAZ Dual Extruder Tool Head v2 with v2c connector
  • ABS filament samples (2)
  • Secondary filament guide tube
  • Secondary extruder harness
  • 3D printed secondary filament spool arm
  • M5 screw, 10 mm (1) and drop-in T-nut (1) for secondary filament spool arm
  • M5 button head screw, 8 mm (1) to replace one control box mounting screw
  • Aluminum bed holster plates (4)
  • M3 low-profile flat head screws (4)
  • Zip ties (7)
  • 3D printed T-nut jig
Included materials

3 Items required

You will also need

  • Metric hex drivers: 4mm, 3mm, 2.5mm, included in your LulzBot TAZ toolkit
  • Scissors or wire cutters for cutting zip ties
  • LulzBot TAZ 6 desktop 3D printer
  • USB cable
  • GNU Linux/Windows/Mac-based computer
Additional items needed

4 Position the Z axis

Let's get started!

Power on your LulzBot TAZ 3D printer.

Home your 3D printer by using the Graphical LCD controller to home the printer.

Raise the Z axis through the Graphical LCD controller.

Navigate to:
Prepare > Move Axis > 1.0 > Z axis > Change the value to at least 200.

After the Z axis stops moving, push the X axis carriage over by hand to the middle of the X axis.

Raise Z axis, position X axis

5 Power off your LulzBot 3D printer

Completely power off your LulzBot 3D printer and unplug the power supply before proceeding.

Power off yout TAZ 3D printer, disconnect the USB cable

6 Install secondary spool arm

Loosen the existing spool arm and slide it down about 2 inches (50mm), and tighten it.

Your TAZ 6 3D printer has the second spool bracket t-nut installed underneath the existing spool arm. You will not need the t-nut included with your Dual Extruder Tool Head v2. Remove the t-nut from the new filament bracket.

Use the M5 screw to install the 3D printed secondary filament spool arm.

Place two spools of filament on the spool arms to ensure they are mounted with sufficient space to rotate during printing.

Attach the secondary filament guide tube included with your new dual extruder, matching the existing feed tube orientation.

Spool arm spacing
Spool arm spacing
Remove t-nut from bracket
Attach secondary filament bracket
Attach secondary filament guide tube

7 Connect secondary extruder harness

Unscrew the cap on the second extruder on the back of the electronics box on your LulzBot TAZ 3D printer, and plug in the secondary extruder harness into the second extruder connector.

Route the new harness next to existing one on your printer, using zip ties to secure it in the same spots.

Use a zip tie to secure the new secondary extruder harness into the empty harness holder on the top left side of the x-carriage.

Connect secondary extruder harness
Recommended zip-tie locations

8 Remove existing tool head

Unplug the connectors for your current tool head.

With one hand support the tool head and unscrew the single M3 screw securing it to the X axis carriage.

Remove the tool head from the 3D printer by lifting the tool head up.

Unplug connectors
Support tool head

9 Record your new tool head E steps

Your new tool head has 2 different Extruder Steps Per Unit (E steps) values. These two important new values can be found on a sticker on the back of the extruder.

Record the first extruder (E0) E steps.

Record the second extruder (E1) Esteps.

Record your new E steps

10 Mount the new tool head

Install the Dual Extruder Tool Head v2 by seating it on the X axis carriage and secure it with the M3 screw that you removed in the previous steps.

Use one hand to support the tool head.

Support and secure tool head

11 Plug in tool head

Remove the tape from the end of the extruder harness and remove the protective foam.

Connect the right-hand primary extruder harness, taking care to note polarity.

Connect the left-hand secondary extruder harness, taking care to note polarity.

Align the two connectors so they sit near the tool head, but not against any moving parts.

Use zip ties to secure the second extruder harness to the 3D printer frame, following the existing wire harness.

Verify the connectors are appropriately connected before proceeding

Remove the tape and foam
Connect the right extruder harness. Note orientation.
Connect the left extruder harness. Note polarity.
Connectors seated and aligned

12 Install Cura LulzBot Edition

Install the latest version of Cura LulzBot Edition. It is important to have the LulzBot Edition of Cura, as it has preset machine configuration profiles built into it.

Cura LulzBot Edition is available from

Plug in your LulzBot TAZ 3D printer to the power supply and power on your 3D printer.

Once powered on connect your 3D printer to your computer using the USB cable.

Open Cura LulzBot Edition.

Cura LulzBot Edition

13 Setup new tool head in Cura

Select Machine > LulzBot TAZ 6.

Select Machine > Machine Settings

In the Machine settings window select Change Tool Head

Select LulzBot TAZ 6
Select Machine settings
Press Change Tool Head button

14 Choose your tool head

Select Dual Extruder v2.

Select Finish to continue.

Select Dual Extruder v2 and press Finish

15 Update firmware

Make sure your 3D printer is plugged into your computer through USB and that your 3D printer is powered on.

If prompted, select Flash the firmware.

Press the Finish button once the firmware update process has completed to exit the wizard.

If prompted, select __Flash the firmware__.

16 Load models into Cura

Load the calibration models in the following order:

Calibration models loaded

17 Open Printer Interface window

Press the Control button to open the Printer Interface window.

18 Level Tool Head

Once the Printer Interface window opens, home the Z-axis by pressing Home Z. Press the Motors off button.

Move the tool head along the X-axis by hand until it sits somewhere in the middle of the X-axis.

Lower the Z axis in small 1mm increments until the nozzle is close to, but not touching, the print surface.

Move the print surface away from the tool head by hand until the tool head leveling screw is accessible. The leveling screw is found on the front dual extruder mount.

Adjust the level of the T1 (front) extruder.

Adjust the screw with the 4mm driver until the two nozzles are the same height above the bed. Turning the screw counter-clockwise raises the front nozzle. Turning the screw clockwise lowers the front nozzle.

Adjust the front extruder height until the resistance felt when a sheet of paper folded in half feels the same when slid under both hot end nozzles.

Adjust the front and rear tool head leveling
Check leveling

19 Calibrate your Dual Extruder Offsets

In order to get the best performance from your Dual Extruder Tool Head v2 you will want to calibrate the following items:

  • Hot end X axis positioning offsets
  • Hot end Y axis positioning offsets.

Recommended Tools:

  • Digital Calipers (A ruler was included with your TAZ 3D printer and can be used)

20 Adjust extruder E steps

Update your extruder steps per unit (E steps) through your Graphical LCD controller.
Note: your E steps will not match the image. Each extruder has unique E steps.

Navigate to: Configuration > Advanced Settings > Scroll down and select E1steps/mm.

Use the control knob on the Graphical LCD controller to adjust the value. (using the E0 value you recorded in step 11)

Adjust the E2steps/mm value. (using the E1 value you recorded in step 11)

Once set, back out of the menu entries until you can select Store Memory.

Select Store Memory to save the adjusted Extruder Esteps/mm.

Use the Graphical LCD to update the E steps

21 Set printer temperatures

Use the terminal entry box in the lower right hand side of the control window to manually enter the GCODE commands.

Set Extruder 0 (rear) as the active extruder:


Press Enter on your keyboard to send the command.

Set Extruder 0 (rear) hot end extrusion temperature to 240°C and the print surface to 110°C by using the Set buttons.

Set extruder 1 (front) hot end as the active extruder:


Press Enter on your keyboard to send the command.

Set Extruder 1 (front) hot end extrusion temperature to 240°C by using the Set button.

Set extruder 0 (rear) hot end as the active extruder:


Manual GCODE terminal
Set temperatures
Send the T1 command to switch to the second extruder
Send the T0 command to switch back to the first extruder

22 Load sample filament

To determine the X and Y axis positioning adjustments needed, we will print the inner and outer square in the next step.

Make sure that both hot ends are at the proper extrusion temperature and that the print surface is at its ideal temperature as well.

Remove the filament used during the factory calibration process.

Load the ABS samples into both extruders: LulzBot Green into the rear extruder and black into the front extruder.

Purge the calibration filament by rotating each large gear by hand until the extruder transitions to the sample filament.

Close the printer interface window.

Factory calibration filament
Remove calibration filament
Load ABS sample filament
Purge sample filament

23 Print calibration squares

Remember: The order in which you select the models matters!

Left click on the smaller, inner square.

23B Right click on the large, outer square and select dual extrusion merge.

Select your material (ABS & ABS), and the Standard print profile.

Switch to Full settings mode by selecting Expert > Switch to full settings.

Copy existing settings

Under the Basic tab turn off:

  • Wipe&prime tower
  • Ooze shield

Press the Control button to open the printer interface window.

Press Print to print the merged Calibration Squares model.

23I As your 3D printer moves to print each portion it will switch between active extruders automatically. Monitor the print progress for it should only take a few minutes. Once the printed objects are complete, leave them on the print surface.

Merge the models
Switch to full settings
Copy the settings
Turn off Wipe&prime and Ooze shield
Press Control button then Print

24 Measure the four gaps

Use your digital calipers or ruler to measure the gap between each model from the top & bottom, and the gap between each side.

Record your current values.

Calibration squares
Measure the gaps using calipers...
... or measure the gaps using a ruler

25 Calculate the offsets

Enter these numbers into our offset calculator found here:

This will produce new offsets, that will need to be updated in the Machine Settings menu. Note the new values.

Close the printer interface window.

Offset Calculator

26 Update new offsets

Open the Machine settings window by selecting:

Machine > Machine Settings

Update your__X__ and Y offsets and save the changes by pressing OK.

Update offsets, your values will be different

27 Print calibration squares

Reprint the inner and outer calibration squares using the previous steps to fine tune the offsets until you are satisfied with the results:

  • Measure the gap
  • Close the printer interface window
  • Update offsets
  • Open printer interface window
  • Set print temperatures
  • Print
  • Measure the gap
  • If the gap widens, reload the models and reverse your model selection order.
Reprint and verify calibration squares spacing

28 Your first dual extruder print


  • The rear extruder is Extruder 0. The front extruder is Extruder 1.

  • The command T0 switches to the rear Extruder 0.

  • The command T1 switches to the front Extruder 1.

  • The order that you import STL files into Cura LulzBot Edition matters. For dual color parts, import the part that you want printed with Extruder 0 (rear) first, then the part for Extruder 1 (front) second.

2 color LulzBot key chain

29 Getting started

We will be printing a two colored keychain!

Download the following 2 models:

Keychain text and body

30 Load the two models

In Cura LulzBot Edition, press Load Model and select keychain-body.stl. The model should now be displayed on the virtual print surface.

Press Load Model again and select keychain-text.stl. The model should now be displayed on the virtual print surface next to the other model.

Keychain body
Keychain text
Both models loaded

31 Merge the models

Left click on the keychain-body model to be printed with the T0 (rear) extruder.

Right click on the keychain text model to be printed with the T1 (front) extruder and select Dual Extrusion Merge.

The models should merge together.

Your virtual print surface should look similar to the final image.

Left click on keychain body
Right click, select Dual Extrusion Merge
Merged models

32 Select your material and quickprint profile

32A Switch back to quickprint mode

  • Select Expert > Switch to quickprint

Under Material select ABS & ABS.

Choose the Standard quickprint profile.

Switch to quickprint mode
Select Standard slicing profile

33 Printing with the Dual Extruder Tool Head v2

Press the Control button to open the Printer Interface window.

The top of the Printer Interface window will display the current printer status.

It will display: Opening, followed by: Connecting, and finally: Operational.

Make sure the print surface is clean, or if required, prep the bed with the recommended print surface treatment.

More information can be found at LulzBot TAZ 6 Cura Profiles, or on the filament product pages at

Printer Interface

34 Print!

Press Print! If you notice filament collecting under the hot end nozzles use tweezers to remove the plastic. Be careful as it will be hot.

Your LulzBot TAZ 3D printer will start printing the skirt around your printed object. As the print progresses the extruder will automatically switch between tool heads throughout the printing process.

Between each tool change the printer will print the ooze shield for cleaner prints, and a priming tower to ensure crisp color transitions.

Printed key chain ready to be removed

35 Remove finished key chain

Remove your printed object once the printer cools to the recommended part removal temperature found on the LulzBot TAZ 6 Cura Profiles page.

Remove the ooze shield from around your 3D printed key chain and the small priming tower.

Use the blue handled part removal tool to lift the corner of the key chain

Lift the key chain off the bed.

Have questions, or ideas? Share them with your fellow LulzBot 3D printer users by joining our user forum at

Remove ooze shield
Lift part off bed
LulzBot key chain
Done! Take me home