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Unresolved Print head not raising at end of print

Discussion in 'Troubleshooting' started by Jeff Hamilton, Apr 29, 2021.

  1. Jeff Hamilton

    Jeff Hamilton Member

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    I am really confused. My print head is dropping by about 1mm at the end of the print and damaging the print rather than raising up before moving. My end script is as follows
    M104 S0 ; turn off extruder
    M140 S0 ; turn off bed
    G1 Z30 ; Move print head up 30mm
    G28 X0 ; home x and y axis
    M84 ; disable motors
    M300 S2600 P100; Beep

    The strange thing it is only on one part I am printing. Other prints there is no problem
    As you can see from the pictures the tool path drops at the end instead of going up.

    Any help would be greatly appreciated
     

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    #1 Jeff Hamilton, Apr 29, 2021
    Last edited: Apr 29, 2021
  2. mark tomlinson

    mark tomlinson ༼ つ ◕_ ◕ ༽つ
    Staff Member

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    M104 S0 ;extruder heater off
    M140 S0 ;heated bed heater off (if you have it)
    G91 ;relative positioning -- important to set this
    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
    M84 ;steppers off
    G90 ;absolute positioning

    Notice the difference? You are probably still in absolute positioning mode from the slicer GCode.
    Never assume -- always set the mode you want :)
     
    #2 mark tomlinson, Apr 29, 2021
  3. Jeff Hamilton

    Jeff Hamilton Member

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    Thank you very much. I knew I was missing something but I couldn't figure it out. Most of my parts are short so the 30mm lift worked, now with the taller part I had a problem.
     
    #3 Jeff Hamilton, Apr 29, 2021
    mark tomlinson likes this.

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