Project Dashboard Calibration Dual Extruder V1 Calibration Workflow

1 Getting Started

Items Needed

  • Ruler
  • Digital Calipers (if preferred)
  • Marker

2 Verify Extruder Calibration

  • Using a ruler or set of calipers, measure 100mm and 110 mm up a length of filament from the top of each extruder body where the filament goes into the machine.

3 Print Test G-Code

  • Load and print the gcode file called Dual_Extruder_E-steps_Calibration.gcode.

  • On your Graphical LCD controller or through Pronterface set each hot end to your desired extrusion temperature (ABS: 230, PLA: 180). Allow the printer to come up to temperature.

    • From your LCD
      • Control > Temperature > Nozzle > XXX
      • Control > Temperature > Nozzle2 > XXX
      • Control > Temperature > Bed > XX
    • From Pronterface
      • Enter desired temperature for the bed and press set
      • Type T0 into the command line to activate the rear extruder
      • Enter desired temperature for rear hot end and press set
      • Type T1 into the command line to activate the front extruder
      • Enter desired temperature for front hot end and pressset
  • Print the Dual_Extruder_E-Step_Calibration.gcode file to extrude out 100mm of filament from each extruder.

  • Measure the distance between the top of the extruder and the 100mm marking to check the calibration. If the extruder overshot the 100mm mark, measure the distance to the 110mm mark and subtract that reading from 110mm.

4 Measure Filament Movement

  • Measure the distance between the top of the extruder and the 100mm marking to determine how far off the calibration is. If the extruder overshot the 100mm mark, measure to the 110mm mark and subtract 10mm from the value.

5 Calculate new Esteps

  • Once you have the amount for filament being fed by each extruder during the extrusion test, calculate the new extruder e-step value using:

    • New_Value = 100*(Old_Value/Measured_Extrusion)

    • If the extruder overshot the 100mm mark, measure the distance to the 110mm mark and subtract that measurement from 110mm.

6 Update the current Esteps

  • Using the LCD screen, navigate to:

    • Control > Motion > Esteps > E1steps and update the values to the new ones calculated.
      • After updating, store your settings. Control > Store Memory
  • For KITTAZ and TAZ 1 users, you will need to reflash your firmware. (If no LCD upgrade has been done)

    • KITTAZ users flashing guide can be found here

    • TAZ 1 users flashing guide can be found here

7 Verify Calibration

  • Perform the previous steps again to verify that the extruders have been calibrated correctly. When calibrated correctly, your 100mm mark will be right on top of the extruder. If not, perform the calibration process again.

  • Once the calibration has been confirmed, proceed to the next step.

8 Leveling Extruders

  • Now that the extruders are calibrated, you are going to need to level them to each other and the print bed.

  • Adjust the Z axis end stop to increase distance between bed and hot ends. (Prevents damage to your glass bed)

  • Home all axis through Pronterface or LCD screen

  • Adjust Z axis end stop, and re-home until the rear extruder is at a distance of two paper widths from the glass bed

  • Position front extruder to same location that rear extruder measurements were taken in previous step.

    * Adjust the thumb screw on the front of the dual extruder until paper resistance is equal to rear extruder
    
  • Check both extruder heights at all four corners by repeating the previous steps.

    • As needed, make adjustments to the four bed corners to ensure equal paper resistance.

9 XY Offset Calibration

  • Open Slic3r

  • Download the Slic3r Dual Extruder Configuration (You may need to right click, and save link as to download.)

  • FlexyDually users will need to download the Slic3r FlexyDually Extruder Configuration

  • Load the Dual Extruder Configuration into Slic3r

    • File > Load Config
    • There may be a warning notice, telling you to manually set the second filament settings.
  • Change the second extruder settings from Default > Dual Extruder Slic3r Config 2x0.35mm Nozzle

  • Download the Calibration Squares.amf.xml

  • Add the Calibration Squares.amf into Slic3r

  • Press Export Gcode and select desired location to save the file

  • Load the Gcode file into Pronterface or on to your SD card

  • Set temperatures from your LCD or Pronterface

    • From your LCD
      • Control > Temperature > Nozzle > XXX
      • Control > Temperature > Nozzle2 > XXX
      • Control > Temperature > Bed > XX
    • From Pronterface
      • Enter desired temperature for the bed and press set
      • Type T0 into the command line to activate the rear extruder
        • Enter desired temperature for rear hot end and press set
      • Type T1 into the command line to activate the front extruder
        • Enter desired temperature for front hot end and press set
  • Once your printer is heated to temperature, print the Gcode file

10 Measure Current Offset

  • Using Calipers or the Ruler, measure how far off the sqaures are from being centered on one another.

  • Measure the gap between the two squares on the left, rigth, top and bottom sides.

  • To determine the offset, plug the measured values into the table found here:

    • Your old X= 0
    • Your old Y= -52

11 Update Your Offsets

  • In Cura, under Machine Settings > Extruder 2.

  • Update the Extruder Offset positions, with the values you found in the previous step.

  • Save your configuration by selecting OK.

12 Correct the Offset

  • Re-Slice and print the Calibration Squares using the updated extruder offset.

  • Measure the top, bottom, left, and right gaps between the two squares to verify equal distance

  • If the gaps are not even, return to "Measure Current Offset"

  • If the gaps are even, Congratulations your dual extruder is calibrated!

Done! Take me home