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Solved What could be causing this?

Discussion in 'Troubleshooting' started by Aflickted, Jan 7, 2018.

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  1. Aflickted

    Aflickted Member

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    I’m at my wits end trying to figure this out. It’s random when it does it but does it on every print. Temp doesn’t change it.
    Calibrated extrusion
    Calibrated Zed
    Ran PID tuning
    Does it with any filament
    Does it with any file( files and filament work fine on other printer)
    Checked files for errors also
    Leveled bed
    Fans running
    Checked for clogs
    Motors not hot/cold while printing just warm

    It leaves an artifact of the missing/shifted part of the layer on the inside of the print.
    I’m thinking it has to be something simple I’m overthinking at this point or something out of my realm of knowing (which is a lot)


    [​IMG][​IMG][​IMG][​IMG]


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    #1 Aflickted, Jan 7, 2018
  2. mark tomlinson

    mark tomlinson ༼ つ ◕_ ◕ ༽つ
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    If it is actually shifting (the layer is misplaced on the X or Y) then it is a loose drive cog almost certainly. Those are subtle because they are not as wild a shift as the loose belt would be. Make sure all of the set screws on the drive cogs are tight. Really tight. Sometimes they are even missing ...
     
    #2 mark tomlinson, Jan 7, 2018
  3. Aflickted

    Aflickted Member

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    Does that look like shifting to you? It’s not an entire layer. Just a partial layer. It’s certainly not aligned right lol. That is one thing I haven’t done is checked set screws. Are you talking about the y belt and x belt?


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    #3 Aflickted, Jan 7, 2018
  4. mark tomlinson

    mark tomlinson ༼ つ ◕_ ◕ ༽つ
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    Yep, the stepper motor that pulls the belts. There is a drive cog on the shaft that locks into the belt teeth.
    It has a couple of set screws (some only have one) that hold it tight to the shaft. If those get loose it can move in small increments and cause problems. Not an entire layer shift, but a 'jog'
     
    #4 mark tomlinson, Jan 7, 2018
  5. mark tomlinson

    mark tomlinson ༼ つ ◕_ ◕ ༽つ
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    Certainly the spots where it indents on the outside of one wall and then comes in on the inside of that same wall... that is a shift, but a small one.
     
    #5 mark tomlinson, Jan 7, 2018
  6. Aflickted

    Aflickted Member

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    Makes a lot of sense. Like I said, something I was overlooking. If it’s not that, would the belts be my next place to look?


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    #6 Aflickted, Jan 7, 2018
  7. mark tomlinson

    mark tomlinson ༼ つ ◕_ ◕ ༽つ
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    Yes, but in all honesty a belt skip is usually a lot more obvious as the model will shift by as much as an inch :) and stay shifted.
    Belt slip is just more obvious, the loose cogs are more evil because they can slip back and forth on the shaft in a small way and the defects are far less 'in your face'
     
    #7 mark tomlinson, Jan 8, 2018
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  8. Geof

    Geof Volunteer Moderator
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    loctite them when you put the setscrews back in and torque them down
     
    #8 Geof, Jan 8, 2018
  9. Aflickted

    Aflickted Member

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    I did check both of them and the y cog “seemed” to have one set screw a little loose. I tighten it down. It’s still doing it unfortunately. Only on the front on the models if that helps determine the culprit.
     
    #9 Aflickted, Jan 8, 2018
  10. Geof

    Geof Volunteer Moderator
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    may need to tighten up the Y belt and pluck the X belt, does it twang or thud?
     
    #10 Geof, Jan 8, 2018
  11. Aflickted

    Aflickted Member

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    Hmmm. More of a thud I would say


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    #11 Aflickted, Jan 8, 2018
  12. Geof

    Geof Volunteer Moderator
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    little loose
     
    #12 Geof, Jan 8, 2018
  13. Aflickted

    Aflickted Member

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    Are they hard to tighten? I don’t see a tensioner other than that spring on the X belt. Doesn’t look like that will take out all the slack I need removed lol.


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    #13 Aflickted, Jan 8, 2018
  14. Geof

    Geof Volunteer Moderator
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    what spring? Picture? The R1 has a zip tie. You have to remove it , tighten up the belt then put a new zip tie on. Or do what @mark tomlinson (and me after seeing his) and add a few to be tensioners.
     
    #14 Geof, Jan 8, 2018
  15. Geof

    Geof Volunteer Moderator
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    #15 Geof, Jan 8, 2018
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  16. Geof

    Geof Volunteer Moderator
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    not my instructable but someone saw the same set up here and made one.
     
    #16 Geof, Jan 8, 2018
  17. Geof

    Geof Volunteer Moderator
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    #17 Geof, Jan 8, 2018
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  18. Aflickted

    Aflickted Member

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    [​IMG]this is the spring/ tensioner I was talking about.


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    #18 Aflickted, Jan 8, 2018
  19. Geof

    Geof Volunteer Moderator
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    That's not stock, I'd do it like the links above personally
     
    #19 Geof, Jan 8, 2018
  20. mark tomlinson

    mark tomlinson ༼ つ ◕_ ◕ ༽つ
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    Never seen one of those used on the belt, but ... not a silly idea.
    You still want to have it with a low bass thrum when you pluck it.
     
    #20 mark tomlinson, Jan 8, 2018
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