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Answered Z axis issue (Common fixes are not working)

Discussion in 'Troubleshooting' started by jdunehew, Jan 20, 2017.

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  1. jdunehew

    jdunehew New Member

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    I have what seems to be a common problem across the board but none of the common fixes that I have seen in these forums, youtube or google searches seem to work.

    It is doing the autolevel (I think G29?) fine where it touches the bed 9 times. When it starts to print it raises just about 1 or 2 millimeters up. Here are some of the things I have tried:

    * I have made sure the switches are fine.

    * They are sitting on exactly the same spot on the brass nuts

    * I have tried changing the z offset and it does not affect the extruder (it goes to exactly the same spot in the air)

    * I have made sure that the Z axis is even on both sides (measuring and moving threaded rods)

    * I have tried Simplify 3D as well as Matter Control - does same thing in any software

    * In Simpify3D if you hit the home Z button it will actually go down and touch the bed

    There were some other things I have tried but I can't think of them right now. Any help would be appreciated. I tried calling the help desk twice for Robo but they don't seem to have any ideas past what I have already tried.
     
    #1 jdunehew, Jan 20, 2017
  2. mark tomlinson

    mark tomlinson ༼ つ ◕_ ◕ ༽つ
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    well, can you post a small sliced GCode file to check out?
    Just so we can make sure it looks correct from that... Something small (like a 10 or 20mm test cube should be enough).

    Have to rule out software before we look at the printer.

    That is certainly not normal operation for the hardware.
     
    #2 mark tomlinson, Jan 20, 2017
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  3. jdunehew

    jdunehew New Member

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    So here is what happens in a video:

    Here is the script section from Simplify3d:
    G28 ; home all axes
    G29 ; probe the bed
    G1 Z5 F5000 ; lift nozzle
    M109 S[extruder0_temperature] ; set the extruder temp and wait
    G1 X0 Y0 ; move to begin wipe
    G1 X20 Z0 F4800 ; wipe



    Here are the first several lines of G after G29:
    SENT: G29
    SENT: G1 Z5 F5000
    SENT: M109 S210
    READ: ok T:72.7 /0.0 B:60.0 /60.0 T0:72.7 /0.0 @:0 B@:127
    READ: ok
    READ: ok
    READ: X:120.00 Y:127.00 Z:-1.00 E:0.00 Count X: 120.00 Y:127.00 Z:-1.00
    READ: ok
    SENT: M105
    READ: Bed x: 15.00 y: 20.00 z: -1.03
    READ: Bed x: 110.00 y: 20.00 z: -0.96
    READ: Bed x: 205.00 y: 20.00 z: -1.14
    READ: Bed x: 205.00 y: 125.00 z: -1.22
    READ: Bed x: 110.00 y: 125.00 z: -1.02
    READ: Bed x: 15.00 y: 125.00 z: -1.10
    READ: Bed x: 15.00 y: 230.00 z: -0.84
    READ: Bed x: 110.00 y: 230.00 z: -0.89
    READ: Bed x: 205.00 y: 230.00 z: -1.15
    READ: Eqn coefficients: a: -0.00 b: 0.00 d: -0.98
    READ: planeNormal x: 0.00 y: -0.00 z: 1.00
    READ: X:205.00 Y:230.00 Z:-1.00 E:0.00 Count X: 205.00 Y:230.00 Z:-1.11
    READ: ok
    SENT: M105
    READ: echo:endstops hit: Z:-1.15
    endstops hit: Z:-1.15
     
    #3 jdunehew, Jan 20, 2017
  4. mark tomlinson

    mark tomlinson ༼ つ ◕_ ◕ ༽つ
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    Other than the Z offset being whack it looks correct.
    I do not see the M565 in your Simplify3D GCode you posted.
    It should be after the G28 and before the G29:


    G28 ; home all axes
    M565 Z-1.0; or whatever your specific numer is, -1.0 is a start
    G29 ; probe the bed
    G1 Z5 F5000 ; lift nozzle
    M109 S[extruder0_temperature] ; set the extruder temp and wait
    G1 X0 Y0 ; move to begin wipe
    G1 X20 Z0 F4800 ; wipe
     
    #4 mark tomlinson, Jan 21, 2017
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