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Unanswered z offset

Discussion in 'Troubleshooting' started by Ron W, May 19, 2015.

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  1. Ron W

    Ron W Member

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    Going from Matter Control to Cura and I can't determine the z offset. My first five layers or so are so thin I can still see through them.... no, I'm not using clear filament... Can someone give clear instructions on how to set it? I know I've seen a couple posts about it, but none of them are very clear.

    Thanks in advance,

    Ron
     
    #1 Ron W, May 19, 2015
  2. Stephen Capistron

    Stephen Capistron Active Member

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    G28 ;home all axis
    M565 Z-1.0 ;Define a 1.0mm offset, this may need adjusting
    G29 ;run autolevel routine

    You have that in your startup G-code? More negative = farther from the bed.
     
    #2 Stephen Capistron, May 19, 2015
  3. Ron W

    Ron W Member

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    default was -1.0. I went to -1.5 before I started this thread, and still the first 4 layers are see through. Here's my code:

    ;Sliced at: {day} {date} {time}
    ;Basic settings: Layer height: {layer_height} Walls: {wall_thickness} Fill: {fill_density}
    ;Print time: {print_time}
    ;Filament used: {filament_amount}m {filament_weight}g
    ;Filament cost: {filament_cost}
    ;M190 S{print_bed_temperature} ;Uncomment to add your own bed temperature line
    ;M109 S{print_temperature} ;Uncomment to add your own temperature line
    G21 ;metric values
    G90 ;absolute positioning
    M82 ;set extruder to absolute mode
    M107 ;start with the fan off
    G28 ;X0 Y0 ;move X/Y to min endstops
    ;G28 Z0 ;move Z to min endstops
    M565 z-1.5 ; Define Z offset at 1.0mm
    G29 ;Run auto-level
    G1 Z15.0 F{travel_speed} ;move the platform down 15mm
    G92 E0 ;zero the extruded length
    G1 F200 E3 ;extrude 3mm of feed stock
    G92 E0 ;zero the extruded length again
    G1 F{travel_speed}
    ;Put printing message on LCD screen
    M117 Printing...
     
    #3 Ron W, May 19, 2015
  4. Ron W

    Ron W Member

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    Just tried -2.0 with the same results
     
    #4 Ron W, May 19, 2015
  5. Ron W

    Ron W Member

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    just out of curiosity, I tried:

    M565 z-20.5 ; Define Z offset at 1.0mm

    And got the same results... I'm guessing M565 is not the correct command line.
     
    #5 Ron W, May 19, 2015
  6. Ron W

    Ron W Member

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    on top of the first several layers being see through, it seems to be removing the bottom 1mm or so from all prints. Anyone have any ideas?
     
    #6 Ron W, May 19, 2015
  7. mark tomlinson

    mark tomlinson ༼ つ ◕_ ◕ ༽つ
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    Use this instead:

    G1 Z1.4 ;Raise Nozzle 1.4 (This is the offset, adjust as needed)
    G92 Z0 ;Force new Z0

    note: no M565

    Not an auto-level user myself, but that may be firmware version dependent from what I see.
     
    #7 mark tomlinson, May 20, 2015
  8. Ron W

    Ron W Member

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    Thanks mark, I'll try this when I get off work.
     
    #8 Ron W, May 20, 2015
  9. Ron W

    Ron W Member

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    Where in the code would that go? I don't see either of those lines in the code.
     
    #9 Ron W, May 20, 2015
  10. mark tomlinson

    mark tomlinson ༼ つ ◕_ ◕ ༽つ
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    Instead of:

    G28 ;home all axis
    M565 Z-1.0 ;Define a 1.0mm offset, this may need adjusting
    G29 ;run autolevel routine

    try:

    G28 ;home all axis
    G1 Z1.4 ;Raise Nozzle 1.4 (This is the offset, adjust as needed)
    G92 Z0 ;Force new Z0
    G29 ;run autolevel routine

    You would switched the startup GCode (there is a setting in the slicers for this).
    I have gathered this from other threads. I am NOT an auto-level user.
     
    #10 mark tomlinson, May 20, 2015
    Mike Kelly likes this.
  11. Ron W

    Ron W Member

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    thanks... I get off in 2 hours, I'll try it and update.
     
    #11 Ron W, May 20, 2015
  12. Ron W

    Ron W Member

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    Same results...
     
    #12 Ron W, May 20, 2015
  13. Ron W

    Ron W Member

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    Going from Matter Control to Cura and I can't determine the z offset. My first five layers or so are so thin I can still see through them.... no, I'm not using clear filament... Can someone give clear instructions on how to set it? I know I've seen a couple posts about it, but none of them are very clear. This is also posted in the Troubleshooting section, but has not been solved as of yet

    Thanks in advance,

    Ron
     
    #13 Ron W, May 20, 2015
  14. Ron W

    Ron W Member

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    default was -1.0. I went to -1.5 before I started this thread, and still the first 4 layers are see through. Here's my code:

    ;Sliced at: {day} {date} {time}
    ;Basic settings: Layer height: {layer_height} Walls: {wall_thickness} Fill: {fill_density}
    ;Print time: {print_time}
    ;Filament used: {filament_amount}m {filament_weight}g
    ;Filament cost: {filament_cost}
    ;M190 S{print_bed_temperature} ;Uncomment to add your own bed temperature line
    ;M109 S{print_temperature} ;Uncomment to add your own temperature line
    G21 ;metric values
    G90 ;absolute positioning
    M82 ;set extruder to absolute mode
    M107 ;start with the fan off
    G28 ;X0 Y0 ;move X/Y to min endstops
    ;G28 Z0 ;move Z to min endstops
    M565 z-1.5 ; Define Z offset at 1.0mm
    G29 ;Run auto-level
    G1 Z15.0 F{travel_speed} ;move the platform down 15mm
    G92 E0 ;zero the extruded length
    G1 F200 E3 ;extrude 3mm of feed stock
    G92 E0 ;zero the extruded length again
    G1 F{travel_speed}
    ;Put printing message on LCD screen
    M117 Printing...
     
    #14 Ron W, May 20, 2015
  15. Ron W

    Ron W Member

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    Waiting for Mike Kelly.... I know he has the solution....
     
    #15 Ron W, May 20, 2015
  16. Stephen Capistron

    Stephen Capistron Active Member

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    Have you changed anything in the firmware?

    When you send M114 to the printer what does it send back?

    Just in the terminal...

    G28
    G1 Z1.4
    G29
    M114
    G1 X100 Y100 Z100
    M114

    Does it look like the print head actually went up 100mm?
     
    #16 Stephen Capistron, May 21, 2015
  17. Stephen Capistron

    Stephen Capistron Active Member

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    If you cut and pasted this, G28 Z0 has a ";" before it.

    Only other thing I can offer is that it is much easier and better to just use "G28" v "G28 X0 Y0 & G28 Z0".
     
    #17 Stephen Capistron, May 21, 2015
  18. mark tomlinson

    mark tomlinson ༼ つ ◕_ ◕ ༽つ
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    It may be the
    M565 z-1.5 ; Define Z offset at 1.0mm
    Not certain that is the way to do that (I have seen differing discussions around this here).
    Someone with an autolevel using Cura can chime in.
     
    #18 mark tomlinson, May 21, 2015
  19. Stephen Capistron

    Stephen Capistron Active Member

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    I use M565 though I do not know what the practical difference between M565 and G92 Z0

    Cut and pasted below is my start-up code.

    G21 ;metric values
    G90 ;absolute positioning
    M82 ;set extruder to absolute mode
    M107 ;start with the fan off
    G1 Z5 ;pull nozzle off bed
    G28 ;home all axis
    M565 Z-0.75 ;Define a 0.75mm offset, this may need adjusting
    G29 ;run autolevel routine
    G1 Z15.0 F{travel_speed} ;move the platform down 15mm
    G92 E0 ;zero the extruded length
    ;G1 F200 E3 ;extrude 3mm of feed stock
    ;G92 E0 ;zero the extruded length again
    G1 F{travel_speed}
    ;Put printing message on LCD screen
    M117 Printing...
     
    #19 Stephen Capistron, May 21, 2015
    mark tomlinson likes this.
  20. Ron W

    Ron W Member

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    Thanks, I'll try your code when I get off work
     
    #20 Ron W, May 21, 2015
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