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Solved Print shifting

Discussion in 'Troubleshooting' started by CDitty, Oct 17, 2017.

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  1. CDitty

    CDitty Member

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    I have had this happen twice now and can't figure out why. For some reason, my print is shifting. When I look at the print in octoprint, layer by layer, everything looks fine. But after it's printed, the entire print is shifted over.

    I've printed other things, both before and after this that print fine.

    Hopefully you can see it in the picture. The holes are supposed to be straight up and down.

    Any thoughts?
     

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  2. mark tomlinson

    mark tomlinson ༼ つ ◕_ ◕ ༽つ
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    Such small shift has to be a drive gear on the stepper. It is too small to be a loose belt. Check the drive gears are tight (and consider using loctite)

    If you haven't already consider lowering the acceleration numbers (the defaults are far too large)
     
  3. CDitty

    CDitty Member

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    Ok thanks. I went in and slowed down the print for the one I posted. It didn't matter.

    Is there someplace that I can go that talks about how to tighten the gears?
     
  4. mark tomlinson

    mark tomlinson ༼ つ ◕_ ◕ ༽つ
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    Not really.
    Sadly.

    Follow the belts for the axis that is shifting and you will see it goes to a drive gear on a stepper motor shaft, that needs to be secure.
     
  5. mark tomlinson

    mark tomlinson ༼ つ ◕_ ◕ ༽つ
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  6. CDitty

    CDitty Member

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    Thanks. I'll check that out.
     
  7. mark tomlinson

    mark tomlinson ༼ つ ◕_ ◕ ༽つ
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    Often the set screws that hold that drive gear on the shaft are either missing or they have gotten loose* and that will let the gear turn slightly on every shaft rotation.




    *loctite
     
  8. CDitty

    CDitty Member

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    Ok. I'll check that. I'm just afraid I'll screw it up and then it won't be useable. :D

    It's weird that it seems to work for so many prints and then it screws up the same way on the same print.
     
  9. mark tomlinson

    mark tomlinson ༼ つ ◕_ ◕ ༽つ
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    So have you run that model through a verifier (like netfab or azure)?

    https://tools3d.azurewebsites.net

    Simplify3D has some built in checks as well if you are using that.
     
  10. CDitty

    CDitty Member

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    I'm on a mac and I use slicr.
     
  11. mark tomlinson

    mark tomlinson ༼ つ ◕_ ◕ ༽つ
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    The azure site doesn't care what OS you use (although I think they stopped outputting STLs by default and you have to reconvert them back). Netfab (free edition works) will spit out STLs post-repair as well.
     
  12. CDitty

    CDitty Member

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    I'm running it through azure right now. I didn't know that existed. I need to stay up on the 3d print world better.
     
  13. CDitty

    CDitty Member

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    How long does it take for the azure to repair? I've had one in there for 3 days and it still says inqueue. I leave the window open until it kicks me out and makes me log back in.

    Can you or someone else look at these and see if they can repair them? I'm waiting to hear back from 3dsimplify before I buy it.
     

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  14. mark tomlinson

    mark tomlinson ༼ つ ◕_ ◕ ༽つ
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  15. CDitty

    CDitty Member

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    <Cussword here> . When you said Netfabb, I downloaded the windows program and have been trying to get it to work. I didn't know there was a web version.
     
  16. CDitty

    CDitty Member

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    And thank you. The bezel looks much better. Printing now and I'll report in on the other after it prints.

    THANKS
     
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  17. mark tomlinson

    mark tomlinson ༼ つ ◕_ ◕ ༽つ
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    :) The windows version works too, but the online is less to deal with.

    edit: And the microsoft Azure one was hanging for me as well, even though I tried Edge and Chrome.
     
  18. CDitty

    CDitty Member

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    I couldn't get the bezel to repair. I only had a few minutes to play with it each time and couldn't figure it out. Just tried the web one and BAM done.
     
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  19. CDitty

    CDitty Member

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    I just tried printing the control panel again and it messed up in the same way. I'm at a loss. The belts are tight. Other prints are printing fine. Watching the gcode previews don't show any errors.
     
  20. Kilrah

    Kilrah Well-Known Member

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    I've had a similar issue with a part the other day that falied with the same shift 3 times in a row with different materials (and speeds). It's a part I've designed myself the usual way so I was pretty confident it wasn't a broken file.

    Since the part was "open" I figured that even if the part hadn't warped/gone unstuck it could have been a case of it deforming jsut enough for the nozzle to hit it at some point causing the shift. I tried rotating it 45° so as not to have edges aligned anymore and it printed fine, so I guess that was the issue. Or the fact I added supports that weren't really needed but filled the holes and maybe allowed the nozzle to better "glide" there (the print always failed pretty much at the top layer of the holes so it seemed it could be related).

    Clipboard01.jpg



     
    #20 Kilrah, Oct 22, 2017
    Last edited: Oct 22, 2017
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