SOLVED Sudden jump and then prints in the wrong place

Discussion in 'Calibration, Help, and Troubleshooting' started by Duncan Chivers, Jul 27, 2016.

  1. Duncan Chivers

    Duncan Chivers Well-Known Member

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    Ok, so no sooner than getting the bed pretty much level, I now have another issue!

    I'm trying to print the right hand tool holder from here: https://www.youmagine.com/designs/bigbox-3d-printing-storage-tools-nozzle-sdcards-nicknack-s-boxes and all seems reasonably well for about 10 minutes, a bit of minor lifting bu generally ok, then out of nowhere there's a sound as if something got caught (nothing visibly did) and the Y axis is then totally off. I cancelled the print and have attached some photos.

    I had just greased the rods before the print, and had even slowed the print speed to 40mm/s in Simplify3D when I compiled the gcode.

    Just really looking for some ideas for the most obvious things to check first?
     

    Attached Files:

  2. TimV

    TimV Well-Known Member

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    Check your voltage on your steppers.
    Also possible overheating issues may cause this.
     
  3. Duncan Chivers

    Duncan Chivers Well-Known Member

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    Overheating of what? The steppers themselves?
     
  4. TimV

    TimV Well-Known Member

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    Yes the steppers themselves.
    Also check loose belts/pulleys, but this I think is less likely, looking at your pics.
     
  5. Duncan Chivers

    Duncan Chivers Well-Known Member

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    Ok, thanks, I'll have a look.
     
  6. Rob Heinzonly

    Rob Heinzonly Well-Known Member

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    If all fails, try to switch the Y- and the X-steppers and see if the problem moves to the X-axis. If it does, you know you have a faulty stepper. I did have the same problem, and replaced the stepper with one I had lying around.
     
  7. Duncan Chivers

    Duncan Chivers Well-Known Member

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    Just checked the voltages, they seem to be ok:

    X: 0.58
    Y: 0.59
    Z: 0.59
    E0: 0.60
     
  8. A Dragon In A Pie Costume

    A Dragon In A Pie Costume Well-Known Member

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    try re-slicing it, could be the file itself
     
  9. eca

    eca Well-Known Member

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    I believe I have an overheating stepper, but how to prevent it? I have just started to have this happen to me too. I have a long print that I am trying to get through and this keeps happening, mostly in the last few hours of an almost 12 hour print. Once only after a few hours.
    Do I have to replace the stepper motor? The voltages for the drivers are all around 0.5V and the belts are tight. It also skips a reliable 10mm every time. I believe it is the stepper, but that sucks that it should go bad after such a short time. Maybe, I just need to get better quality motors, any suggestions?
     
  10. mike01hu

    mike01hu Well-Known Member

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    More likely a driver.
     
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  11. eca

    eca Well-Known Member

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    After doing a 12 hour print over night with a fan cooling everything down, the same thing. I will try changing the driver next, always start with the easiest solution. Thanks for the tip.
     
  12. Oliver

    Oliver Active Member

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    What is the driver type we have on our bigboxes ?
     
  13. tohara

    tohara Well-Known Member

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    A4988
     
  14. eca

    eca Well-Known Member

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    Mine is mixed, I have the A4988 on the Z-axis and Drv 8825 on the X an Y axis. I found them quieter on the X and Y, but my Z axis didn't like them so much and was actually louder. Maybe I didn't have them tuned right...
     
  15. tohara

    tohara Well-Known Member

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    I assumed the question was what was the stock driver. I am running with TMC2100 on all.
     
  16. Jasons_BigBox

    Jasons_BigBox Well-Known Member

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    Take a look at my thread about weird height variations, I was finding that my z-axis was skipping layers.

    I tried a few things, regreased the rods and screws, turned up the voltages but that made things worse. I turned the voltage down to 0.45v (on the z only) and things look a lot better.

    I've not been able to check the temperatures, I keep forgetting!

    Good luck!

    Jason
     
  17. Duncan Chivers

    Duncan Chivers Well-Known Member

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    Ok, solved!
    You won't believe the simple (and really annoying!) solution.
    On the Y axis, there's obviously a rod that controls movement, by turning the belts and moving everything backwards and forwards. Where the belts wrap around the bar there is a stainless steel cog to allow the belt to move. The screw in the cog was not tight. I actually had a screw loose (!).
    As soon as I tightened it, which was a tricky manoeuvre due to the space available, the prints started moving much more smoothly (as you would expect), and all seems well.

    Thanks to all for your help and suggestions.
     
  18. Duncan Chivers

    Duncan Chivers Well-Known Member

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    PS, if I had listened to @TimV ages ago I would have found it sooner!
     
  19. TimV

    TimV Well-Known Member

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    :)
    Told you so :)
    Greetz
     
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  20. Kanedias

    Kanedias Well-Known Member

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    All those grub screws need loctite on them or they'll loosen again.
     
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