Project Dashboard Accessories and Upgrades LulzBot Mini Flexystruder Tool Head v2 Installation LulzBot Mini Workflow

1 Congratulations!

You just upgraded your LulzBot desktop 3D printer with a Flexystruder Tool Head v2. After following this Quick Start Guide, your LulzBot 3D printer will be more capable than ever. Let's get started!

LulzBot Mini Flexystruder v2 Tool Head

2 Record Flexystruder ESteps

Your new Flexystruder has a different Extruder Steps Per Unit (ESteps) value than the standard Mini tool head. This important new value can be found on a sticker on the back of the extruder.

Record this value before continuing.

Record Flexystruder ESteps

3 Included Materials

Included Materials

  • Flexystruder v2 Tool Head
  • LulzBot Green Ninjaflex sample filament
  • Glue stick (Elmer's® or UHU® brand)
  • 2.5mm hex driver
  • 4mm hex driver
  • Zip ties
Included materials

4 Additional Items Needed

You will also need

  • Scissors or wire cutters for cutting zip ties
  • LulzBot Mini desktop 3D printer
  • USB cable, included with your LulzBot Mini
  • GNU/Linux/Windows/Mac-based computer
Additional items needed

5 Position The Z Axis

If needed, connect to your 3D printer using Cura, and raise the Z axis off the bed by homing the 3D printer.

Raised tool head

6 Power Off Your LulzBot 3D Printer

Power off your LulzBot 3D printer and unplug the power cord and USB cable before proceeding.

If a filament reel is still present, cut the filament and remove the reel.

Power off your 3D printer

7 Remove Connector Cover

Using your 2.5mm driver, unscrew the two M3 screws that secure the connector cover on the X axis carriage.

Using the scissors, cut the two zip ties that secure the harness to the carriage.

Lift the connector away from the X axis carriage.

Unplug the tool head connector from the wiring harness.

Remove connector cover
Cut zip ties
Unplug the connector

8 Remove Existing Tool Head

Remove the bottom screw first!

The tool head is attached with three screws. The print surface can be damaged if the tool head is allowed to fall onto the print surface.

With one hand, support the tool head.

Using the 4mm driver, unscrew the three M5 screws securing the tool head to the X axis carriage.

Remove the bottom screw first, followed by the remaining two screws.

Remove the tool head from the printer by lifting the tool head away from the printer.

Remove bottom screw first!
Remove second screw
Support tool head and remove last screw

9 Mount The New Tool Head

Press the Flexystruder onto the X axis carriage, aligning the tab with the cutout on the back of the new tool head.

Secure it to the X axis carriage by loosely screwing in the top two screws.

Leave the top two screws loose.

Install the last screw into the bottom of the X axis carriage and fully tighten.

Tighten the top two screws.

Mount new tool head

10 Plug In Tool Head

Connect the two 16 pin connectors, making sure to match them based on the pins in the connector.

Verify the connectors are appropriately connected before proceeding

Secure the tool head wiring harness to the X axis carriage with 2 zip ties. Trim off the excess from each zip tie.

Plug in tool head
Secure harness with zip ties

11 Mount Connector Cover

Cover the connector with the connector cover and attach it to the X axis carriage using the two M3 screws and the 2.5 mm driver.

Don't pinch any of the wires when securing the cover.

Mount connector cover plate

12 Install Or Update Cura LulzBot Edition

Cura LulzBot Edition is available from:

Install Cura LulzBot Edition if not already installed on your computer.

If Cura has already been installed, update to the latest version, as it has preset machine configuration profiles.

Plug in your LulzBot Mini 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

In Cura:

  • Select Machine > LulzBot Mini

  • Select Machine > Machine settings

In the Machine settings window:

  • Select Change Tool Head
Select LulzBot Mini
Open Machine settings
Change tool head

14 Choose Your Tool Head

Select LulzBot Mini with Flexystruder.

Select Flexystruder

15 Update your Flexystruder E-steps

Press the Finish button to exit the tool head wizard.

In order to get the best performance from your Flexystruder Tool Head v2, update the extruder steps per unit (or e-steps) with the recorded value found on your Flexystruder, recorded in step 8.

Enter your E-Step value to the field labeled "E-Steps per 1mm of filament"

Click Ok to save these settings.

Exit tool head wizard
Enter E-Step value into E-Step field

16 Open Printer Interface Window

In Cura LulzBot Edition, load the key chain test print. The model can be downloaded here:


Locate the included glue stick.

SemiFlex and NinjaFlex will adhere exceedingly well to the print surface. To aid part removal, evenly apply glue stick to the print surface.

Failure to do so may cause the printed flexible part to bond permanently to the PEI print surface.

Press the Control button to open the Printer Interface window.

Key chain loaded
Apply glue stick
Printer Interface window

17 Prepare Your 3D Printer

SemiFlex and NinjaFlex will adhere exceedingly well to the print surface. To aid part removal, evenly apply glue stick to the print surface.

Failure to do so may cause the printed flexible part to bond permanently to the PEI print surface.

Turn on the hot end by setting the extrusion temperature to 220°C.

You are almost ready to print!

Did you apply glue stick?
Set hot end to 220°C

18 Remove filament

Your Flexystruder tool head was calibrated before leaving our factory. Once the printer is up to extrusion temperature remove the filament.

In Cura, press the Retract 10 button as needed to remove the filament from the hot end.

Remove the filament from the extruder.

Press Retract 10
Remove filament

19 Load And Extrude Filament

Load the NinjaFlex filament sample into the extruder body.

Press the Motors off button.

Slowly rotate the large gear by hand, counter-clockwise, to feed the filament into the hot end.

Once your 3D printer is at the appropriate extrusion temperature of 220°C, finish loading the filament by rotating the large gear counter-clockwise until the extruded filament underneath the hot end nozzle transitions to LulzBot green.

Press the Motors off button
Load flexible filament sample
Rotate large gear counter-clockwise to load
Extrude filament

20 Turn Off The Hot End

Turn off the hot end by setting the hot end temperature to 0.

If you notice filament collecting under the hot end nozzle use tweezers to remove the plastic.

Be careful as the extruded filament will be hot.

Close the Printer Interface window.

Turn off hot end

21 Select Material And Quickprint Profile

Under Material select NinjaFlex (Fenner Drives).

Choose the Standard quickprint profile.

Press the Control button to open the Printer Interface window.

Select NInjaFlex and Standard
Open Printer Interface window

22 Your First Flexystruder Print

Press Print!

Your LulzBot Mini 3D printer will automatically do the following:

  • Home each axis.
  • Set hot end cleaning temperature.
  • Once the hot end cleaning temperature has been achieved it will retract the filament.
  • Nozzle cleaning routine.
  • Bed level probing: Watch this process! If the print surface is visibly compressed during the probing sequence your nozzle is too dirty. Power down the printer, cancel the print, and home the Z axis. Wipe off the warm nozzle with a clean dry cloth.
  • Once the bed level probing is complete the hot end will warm to the required printing temperature.
  • When the hot end is at the appropriate temperature, your 3D print will begin!
Press Print!
Printed flexible key chain

23 Remove Key Chain Once Cool

After the key chain has been printed the tool head will move away from the completed model. The bed will move forward once the printer cools to the recommended part removal temperature.

Remove your printed object by using the blue-handled pry tool to lift the part from the bed.

To switch back to the original tool head, follow the same steps outlined in this guide, except this time, select the Standard LulzBot Mini tool head and options.

Have questions, or ideas? Share them with community by joining our user forum at

Printed key chain ready to be removed
Lift part off bed
Pull key chain off the print surface
Pull key chain off the print surface
Done! Take me home