You will also need
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.
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.
Your new tool head has a different hot end length than the standard tool head on your LulzBot TAZ. A screw used to attach the control box to the LulzBot TAZ 3D printer frame will need to be replaced.
The screw is located on the rear, left-hand side vertical extrusion.
Hold the upper T-nut in place with the T-nut jig. Insert the jig into the aluminum extrusion channel prior to removing the screw. If it does fall lift it back up.
Remove the top rear 10mm M5 bolt and replace it with the lower profile 8mm M5 screw.
Remove the jig once the screw has been replaced.
Additional clearance is necessary for the extrusion fan ducts on your new dual extruder.
Remove the four original 3D printed bed corner fingers using a 2.5mm hex driver.
Using a 2mm hex driver and the included 3mm flat head screws replace the bed corner fingers with the new lower profile aluminum bed holster plates.
Loosen the existing spool arm and slide it down about 2 inches (50mm), and tighten it.
Insert the new T-nut included with your Dual Extruder Tool Head v2 on the same z-axis vertical frame (the front right extrusion), in the same channel.
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.
Unscrew the cap on the second port on top of the electronics box on your LulzBot TAZ 3D printer, then plug in the secondary extruder harness into the uncapped port.
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 the two 16 pin connectors, making sure to match them based on the pins in the connectors. Note: You may have one or two spare fan connectors that will not be used.
Use zip ties to secure the second extruder harness to the 3D printer frame, following the existing wire harness.
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 http://LulzBot.com/Cura.
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.
To prevent damage to your 3D printer, power it off immediately if the tool head looks like it is on a course to lower into the print surface before triggering the Z end stop.
If the tool head looks like it will prematurely trigger the Z end stop too high above the print bed, adjust the thumb screw lower and restart this process.
The spring and washer can be removed if needed to achieve the proper Z height.
Once the Printer Interface window opens, home the printer by pressing Home Z.
Adjust the homing height by repeatedly homing the Z axis and turning the Z axis end stop trigger until a sheet of paper folded in half just barely slides under the rear nozzle.
To adjust the level of the T1 (front) extruder push the bed away to have access to the leveling screw. The leveling screw is found on the front dual extruder mount.
Adjust it 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.
In order to get the best performance from your Dual Extruder Tool Head v2 you will want to calibrate the following items:
Use the Graphical LCD controller to clear the EEPROM settings from the previous firmware.
Navigate to: Configuration and select Restore Failsafe.
Scroll up and select Advanced settings > Esteps/mm to update the extruder steps per unit (E-steps or esteps) to get the best performance from your Dual Extruder Tool Head.
Use the control knob on the Graphical LCD controller to adjust the value.
Adjust the E2stps/mm value.
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 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.
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.
Left click on the smaller, inner square.
27B Right click on the larger, 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:
Press the Control button to open the printer interface window.
Set both hot ends to 240°C, and the bed to 100°C. Remember, to switch to the second extruder send the T1 command. To switch back to the first extruder send the T0 command.
Press Print to print the merged Calibration Squares model.
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.
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.
Enter these numbers into our offset calculator found here: https://www.lulzbot.com/dual-extruder-calibration-calculator
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.
Reprint the inner and outer calibration squares using the previous steps to fine tune the offsets until you are satisfied with the results:
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.
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.
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.
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.
Bring your 3D printer up to the recommended temperatures for your material. This guide uses the temperature for printing with ABS in both extruders.
Set the first hot end and the heated bed to the recommended temperature setting, by typing the desired temperatures into each temperature box.
Press each Set button to turn on the first hot end and bed.
Switch to the second extruder by typing T1 in the manual GCODE terminal text box.
Make sure to capitalize the command, as it is required.
When the command is correctly entered, you'll see confirmation in the gcode command output window:
echo: Active Extruder: 1
The first extruder, T0 is to the rear, T1 is in the front.
Set the second extruder to the recommended print temperature by pressing the Set button.
Switch back to the main, rear extruder by sending the command T0.
If you notice filament collecting under the hot end nozzles use tweezers to remove the plastic. Be careful as it will be hot.
Once the printer has come up to the proper printing temperature for your filament, press Print!
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.
Remove your printed object once the printer cools to the recommended part removal temperature found on the LulzBot TAZ Cura Profiles page.
Have questions, or ideas? Share them with your fellow LulzBot 3D printer users by joining our user forum at Forum.LulzBot.com