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Solved Prints have sharp edge

Discussion in 'Troubleshooting' started by spankurmonkey, Jan 31, 2017.

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  1. spankurmonkey

    spankurmonkey Member

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    I am noticing that my prints have this edge on them and I am wondering if there is something with the printer or in S3D that I should change to reduce it if at all ?

    [​IMG]
     
    #1 spankurmonkey, Jan 31, 2017
  2. Spidematt

    Spidematt Member

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    Looks like z wobble
     
    #2 Spidematt, Jan 31, 2017
  3. spankurmonkey

    spankurmonkey Member

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    Ok. and how does one combat z wobble ??
     
    #3 spankurmonkey, Jan 31, 2017
  4. spankurmonkey

    spankurmonkey Member

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    I should note that if I print on a raft it's not there.. but I am new to all of this stuff so I really have no clue what I am talking about .. just trying to find a solution if there is one.
     
    #4 spankurmonkey, Jan 31, 2017
  5. WheresWaldo

    WheresWaldo Volunteer ( ͠° ͟ʖ ͡°)
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    You mean the elephants foot on the bottom. Usually means Z Offset is too low or your bed is way to hot.
     
    #5 WheresWaldo, Jan 31, 2017
  6. spankurmonkey

    spankurmonkey Member

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    I don't have any offset set and I am printing with eSun PLA and the bed temp is at 70c.
     
    #6 spankurmonkey, Jan 31, 2017
  7. WheresWaldo

    WheresWaldo Volunteer ( ͠° ͟ʖ ͡°)
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    Are you sure there is no offset?

    Try printing PLA with a bed temp no more than 45°C
     
    #7 WheresWaldo, Jan 31, 2017
  8. spankurmonkey

    spankurmonkey Member

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    Where would I check for offset? in the slicer? If so I have looked at S3D GCode tab and the Origin offset is 0.00
     
    #8 spankurmonkey, Jan 31, 2017
  9. WheresWaldo

    WheresWaldo Volunteer ( ͠° ͟ʖ ͡°)
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    In S3D Scripts >> Starting Script look for a line that starts with M565
     
    #9 WheresWaldo, Jan 31, 2017
  10. spankurmonkey

    spankurmonkey Member

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    I don't have a M565 in my starting scripts tab.
     
    #10 spankurmonkey, Feb 1, 2017
  11. mark tomlinson

    mark tomlinson ༼ つ ◕_ ◕ ༽つ
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    The you need one. You need the Z to start a little further off the bed (more negative) and since you are not specifying one it is likely "0"

    Start with the default -1.0 and experiment.

    Do not use the Origin offset.
     
    #11 mark tomlinson, Feb 1, 2017
  12. spankurmonkey

    spankurmonkey Member

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    I can try that.... but for bed temp everywhere I read they say for PLA 70c
     
    #12 spankurmonkey, Feb 1, 2017
  13. mark tomlinson

    mark tomlinson ༼ つ ◕_ ◕ ༽つ
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    Then you are reading the wrong places :)

    PLA is intended to print with no external heat on bed.

    In reality, if you have a heated bed it is usually a good idea to use a bit of heat to aid in first layer adhesion, but if you get above the glass transition temperature for PLA then it will be bad. PLA (as you know from reading) has a tG (glass transition temperature) of 60-65 °C
     
    #13 mark tomlinson, Feb 1, 2017
  14. spankurmonkey

    spankurmonkey Member

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    This is my start script... where should the M565 go?

    G28 X0 Y0 Z0 ; home all axes
    G1 Z5 F5000 ; lift nozzle
    G28 X0 Y0 Z0 ; Home Z again in case there was filament on nozzle
    G29 ; probe the bed
     
    #14 spankurmonkey, Feb 1, 2017
  15. mark tomlinson

    mark tomlinson ༼ つ ◕_ ◕ ༽つ
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    G28 X0 Y0 Z0 ; home all axes
    G1 Z5 F5000 ; lift nozzle
    G28 X0 Y0 Z0 ; Home Z again in case there was filament on nozzle
    M565 Z-1.0 ;test and adjust this as needed. more - is further from bed, more + closer
    G29 ; probe the bed
     
    #15 mark tomlinson, Feb 1, 2017
  16. spankurmonkey

    spankurmonkey Member

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    do you think I should do both the temp and the M565 or do a process of elimination? I.e. do the temp first if the edge is still there then do the M565 adjustments?
     
    #16 spankurmonkey, Feb 1, 2017
  17. mark tomlinson

    mark tomlinson ༼ つ ◕_ ◕ ༽つ
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    They both will have some impact, but changing one thing at time is always the best way to troubleshoot :)
    Maybe you are happy after setting the Z offset and don't want to change anything else.

    Up to you.
     
    #17 mark tomlinson, Feb 1, 2017
  18. WheresWaldo

    WheresWaldo Volunteer ( ͠° ͟ʖ ͡°)
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    One suggestion on the G28 line, I am not a fan of specifying all three axes separately, the Marlin code doesn't behave the same way as opposed to just telling it to home all. So I would change the code to something like this:
    Code:
    G28 ; home all axes
G1 Z5 ; lift nozzle
M565 Z-1.0 ; test and adjust this as needed. more - is further from bed, more + closer
G29 ; probe the bed

    Also, when using S3D since it heats before executing the Starting Script there is no real need for the redundant G28 to home all axes. Getting rid of the feed rate (F5000) in the nozzle lifting line is also a good idea, it could mitigate mysterious extruder issues. If you really must wipe just home Z:
    Code:
    G28 Z0 ; Home Z axis to wipe nozzle
G1 Z5 ; Lift nozzle
G28  ; Home all axes
M565 Z-1.0 ; More - is further, more + closer to bed
G29 ; Probe the bed

    If you really want to wipe the nozzle, you can change to relative mode then change back to absolute mode after the wipe, kinda like this:
    Code:
    G28 Z0 ; Home Z axis to wipe nozzle
G91 ; Sets relative positioning
G1 X5 ; Moves 5 mm in a positive direction (could easily be Y axis)
G1 X-5 ; Moves 5 mm in a negative direction
G90 ; Resets absolute positioning
G1 Z5 ; Lift nozzle
G28  ; Home all axes
M565 Z-1.0 ; More - is further, more + closer to bed
G29 ; Probe the bed
     
    #18 WheresWaldo, Feb 1, 2017
    Last edited: Feb 1, 2017
    mark tomlinson likes this.
  19. spankurmonkey

    spankurmonkey Member

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    Mark.. changed the bed to 55c and then did the M565.... printed the 20mm cube and its much better but barely any adhesion to the bed.

    What sort of change is needed to bring the surfaces closer so there is better bed adhesion ?
     
    #19 spankurmonkey, Feb 1, 2017
  20. mark tomlinson

    mark tomlinson ༼ つ ◕_ ◕ ༽つ
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    Adjust the M565 z offset

    less negative is closer to the bed.
     
    #20 mark tomlinson, Feb 1, 2017
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