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Solved R1+ homes to top left when finished printing, dragging TPU string across the print.

Discussion in 'Troubleshooting' started by twistedplastic, Sep 21, 2022.

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  1. twistedplastic

    twistedplastic New Member

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    Can I make it home to the bottom right instead? This problem has developed fairly recently and only happens when using Ninjatek Cheetah filament.

    Retraction settings are: length on move 1mm, and retraction speed 30mm/s. I tried raising them to 3mm and 50mm/s respectively and the texture of the print got more rough without preventing the string at the end.

    Can anyone help me stop the printer from doing this?
     
    #1 twistedplastic, Sep 21, 2022
  2. mark tomlinson

    mark tomlinson ༼ つ ◕_ ◕ ༽つ
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    Whatever slicer you are using should have a way to set an ending GCODE block and what you have currently is homing the X and Y when completed. What you should do is stop that :) Instead have it lift the nozzle first and then home X and Y:

    Here is an example, note the highlighted line:

    M104 S0 ;extruder heater off
    M140 S0 ;heated bed heater off (if you have it)
    G91 ;relative positioning
    G1 E-1 F300 ;retract the filament a bit before lifting the nozzle, to release some of the pressure
    G1 Z+0.5 E-5 X-20 Y-20 F9000 ;move Z up a bit and retract filament even more
    G28 X0 Y0 ;move X/Y to min endstops, so the head is out of the way
    G1 Y150 F5000 ;move completed part out
    M84 ;steppers off
    G90 ;absolute positioning
     
    #2 mark tomlinson, Sep 22, 2022
  3. twistedplastic

    twistedplastic New Member

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    Thanks very much for your help! I should have mentioned that I'm using MatterControl 1.7.

    I've been 3D printing for a few years, but haven't really messed around with G-code. I've looked at the terminal, but I'm not exactly sure how to input the code. Do I copy the code you provided, paste it into the window at the bottom, and click send?
     
    #3 twistedplastic, Sep 22, 2022
  4. mark tomlinson

    mark tomlinson ༼ つ ◕_ ◕ ༽つ
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    #4 mark tomlinson, Sep 22, 2022
  5. mark tomlinson

    mark tomlinson ༼ つ ◕_ ◕ ༽つ
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    Just remember that when adding gcode to the ending block you do NOT want to lower the Z. Home X = fine, home Y = fine, but do not try to HOME the Z or you run the risk of crashing the extruder into the print.
     
    #5 mark tomlinson, Sep 23, 2022
  6. twistedplastic

    twistedplastic New Member

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    Thanks for all the help! I'll give it a try.
     
    #6 twistedplastic, Sep 23, 2022
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  7. twistedplastic

    twistedplastic New Member

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    Once I understood where to paste the code, it worked perfectly. I'm very interested in learning more G-code now. Thanks again for your help.
     
    #7 twistedplastic, Sep 28, 2022
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  8. mark tomlinson

    mark tomlinson ༼ つ ◕_ ◕ ༽つ
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    Excellent.

    Marlin has a resource / reference for their GCode here: https://marlinfw.org/meta/gcode/

    While almost all 'flavors' of code (like Marlin, Repetier and many others) are very similar it helps to use a reference for the GCode maker you have. Our laser and CNC machines use GCode too, but not exactly the same as Marlin.
     
    #8 mark tomlinson, Sep 29, 2022
  9. twistedplastic

    twistedplastic New Member

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    Thanks for the link - it looks like a good place to start.
     
    #9 twistedplastic, Sep 30, 2022
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