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Dual extruders single nozzle, any example scripts to start with Cura?


Mister Fab
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Posted · Dual extruders single nozzle, any example scripts to start with Cura?

Hello all,

 

I am new to Cura, after having using S3D a long time.

 

I am trying to configure my printer (Tevo Tornado, Marlin firmware) to work with dual extruders.

It already works well with a single extruder with Cura, and dual extrusion worked with S3D.

 

Would someone have an example of the configuration scripts used for each extruder? 

I have made several tries but I don't understand how Cura manages the dual extrusion.

 

For example, I have a test cube,  starting full black for  10 layers, then whithe for another 10 layers then back to black etc...

But when the print is launched, it makes a tool change on each layer( retract the PLA on tool 1, and reinsert the same ), just to keep the same color and going back to print.

 

If anyone has any advice, it will be welcome.

 

Thank you for reading

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    Posted (edited) · Dual extruders single nozzle, any example scripts to start with Cura?

    I just reviewed a bug report on Github and it involves the same sort of behavior.  In that case it appears to be a problem with the implementation of the Prime Tower.  There is also a discussion HERE on this forum posted by the same person.  That poster has a 4 in 1 out hot end.

     

    If you would load your models and set Cura up to slice and use the "File | Save Project"  command and post the 3mf file here I'll take a look. 

     

    Playing with my printer configured with a 2-in-1-out hot end what I found was:

    • With the Prime Tower enabled:
      • If the bottom part us printed with T0 and the top with T1 there is only 1 tool change in the gcode file.
      • If the bottom part is printed with T1 and the top with T0 then there are 63 tool changes in the file.
    • With the Prime Tower disabled:
      • It doesn't matter which extruder is used for the bottom part - there is only 1 tool change in the gcode.

    A bit more evidence that the Prime Tower is the guilty party.  Maybe @nallath has a take on this.

     

    EDIT:  I'm getting the same sort of results with a UM S5 as the active printer.

     

    Edited by GregValiant
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    Posted · Dual extruders single nozzle, any example scripts to start with Cura?

    Thank you very much for your help GregValiant,

     

    I'll have a look on the parameters as soon I'll be home tonight, and I'll make you a feedback.👍

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    Posted · Dual extruders single nozzle, any example scripts to start with Cura?

    Hi GregValiant,

     

    Only had the time to go back to my printings tonight.

     

    I exported you the project.

     

    For information, I configured my scripts using a tutorial about dual extrusion and single nozzle

    https://www.instructables.com/TEVO-Tornado-Dual-Extrusion-Beaus-TL-Feeder-Versio/

    CFFFP_Dual_Extrusion_Calibration_A.3mf

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    Posted · Dual extruders single nozzle, any example scripts to start with Cura?

    Thanks for the file.

    If you haven't done it yet, go to the MarketPlace and load the "Printer Settings" plugin.  After restarting Cura the Printer Settings section will be below the Experimental section.  Within Printer Settings enable "Extruders Share Heater" and "Extruders Share Nozzle".  Those are specific for multi-in-one-out hot ends.  They keep Cura from dropping the hot end temp to Standby temperature when tools are changed.

     

    You can use that model for calibration.  Change which extruder prints which model so the model touching the build plate will start out with extruder 1.

    When a model starts out with extruder 1 the bug I mentioned doesn't activate.  If a print starts out with extruder 2 is when the tool changes happen every layer change.  On that model it isn't too bad as starting with extruder 2 shows 22 tool changes and starting with extruder 1 shows 18 tool changes.

    The top section of the model has that plug that sticks up from the model below so there will be tool changes every layer for the top 10 layers.

     

     

     

     

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