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Answered how can I fix this

Discussion in 'Troubleshooting' started by fredm, Apr 9, 2017.

  1. fredm

    fredm Member

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    My printer does this whenever I print a round item like a pumpkin or attached pic of a cup.

    what causes this and how can I fix it?
     

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    #1 fredm, Apr 9, 2017
  2. mark tomlinson

    mark tomlinson ༼ つ ◕_ ◕ ༽つ
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    #2 mark tomlinson, Apr 9, 2017
  3. Geof

    Geof Volunteer Moderator
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    First guess is agree with @mark tomlinson to hot on the overhangs, probably not cylindrical only, just the most noticeable
     
    #3 Geof, Apr 9, 2017
  4. fredm

    fredm Member

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    okay so lower temp and speed.
    lower temp in increments of 5 degrees? 10 degrees?

    funny thing is there is a small portion that always prints fine, maybe 30 percent
     
    #4 fredm, Apr 10, 2017
  5. daniel871

    daniel871 Well-Known Member

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    Invert the cup in your slicer, see if the inside of the cup does the same thing.
     
    #5 daniel871, Apr 10, 2017
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  6. mark tomlinson

    mark tomlinson ༼ つ ◕_ ◕ ༽つ
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    It is a judgement call. If you had a small test print that was demonstrating this I would say go in really small increments, but use whatever seems reasonable. At least 5 degree increments given the size.
     
    #6 mark tomlinson, Apr 10, 2017
  7. daniel871

    daniel871 Well-Known Member

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    It's hard to see in the image, but it looks like the base of the cup is doing the same thing, so you may need to check for over-extrusion, or maybe look at the minimum layer time setting and play with it.
     
    #7 daniel871, Apr 10, 2017
  8. fredm

    fredm Member

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    I lower the temp by 10 degrees. On a different print still have some issues.
    I will have to try with the same exact design.

    but what I dont understand is, if its an issue with overheating/ cooling. why didnt it occur when printing the smaller stem of the glass where each layer is being laid down faster?. and also only on one side, when it did occur?
     
    #8 fredm, May 1, 2017
  9. WheresWaldo

    WheresWaldo Volunteer ( ͠° ͟ʖ ͡°)
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    The steeper angle and unsupported perimeters are some of the issue. A few things can work to help fix this, more cooling which is usually impractical since you are likely cooling it already, printing that section faster but again requires a lot of work since most slicers can't do this on their own, lower layer heights will make the overhang smaller at the expense of exponential increases in print time.

    When slicers all adopt the variable layer height model then things like adjusting layer height to meet situation like this will be easier.
     
    #9 WheresWaldo, May 1, 2017
  10. Ryan TeGantvoort

    Ryan TeGantvoort Active Member

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    After the first say 5 layers (your preference), shut the bed heater off. Basically the only thing the bed heater is used for is bed adhesion. I've noticed this helps drastically with overhangs and bridges. My experience, yours may differ.
     
    #10 Ryan TeGantvoort, May 1, 2017
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