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Mid-Print X/Y Problem


Futz34
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Posted · Mid-Print X/Y Problem

Hi! I've had good luck so far with my UM2+ in the last year that I have owned it. I rarely have problems but this has happened on occasion. I'm in the middle of a rather large 19 hour build on a .4mm tip and .15 mm layer height, the print has shifted in the X/Y dimension. You can see the layers printing a few inches diagonally off to the side. What would have caused this? Do I have a corrupt file? Or maybe did the tip catch on some plastic and it screwed up where it thinks it is? Thanks much in advance!

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    Posted · Mid-Print X/Y Problem

    It's kinda hard to tell but Is it shifted in both X and Y directions?

    If its just one axis it could be a loose pulley. Just tighten the pulley grub screw. (after axis alignment) 

    This happened to me a few weeks ago on a large print. But for two pulleys to go at the same time would be incredibly unlikely. 

     

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    Posted · Mid-Print X/Y Problem

    Yes, it's in both directions. So I suspect after watching a few videos that it bumped into some material and messed up the x/y calibration. I ran a smaller print after cleaning this all up and everything worked just fine. So now I'm doing the Z-hop option to ensure that this doesn't happen again.

     

    What is the axis alignment you speak of? Is this part of regular maintenance? I looked it up and I don't have that spacer tool they use although I could obviously print it. 

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    Posted · Mid-Print X/Y Problem

    I had this once but then the protected cover of the print head was ripped. 

    now i don't know if the S2+ has the same cover, but it is worth looking.

     

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    Posted · Mid-Print X/Y Problem

    Are there steep overhangs that curled up, and where the nozzle bumped into? Causing it to skip steps?

     

    Or maybe a loose pulley could also gradually cause this? First it might cause an X-shift due to sitting loose. And then the edges would curl up, or the deformed part would otherwise get in the way, and the nozzle bumping into it might cause and Y-shift then, due to skipping steps? Just guessing, but maybe worth checking?

     

    Or drivers overheating, and temporarily shutting down? But this seems less likely, at least here in winter.  :-)

     

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    Posted · Mid-Print X/Y Problem

    Hi guys, yes there were a lot of steep overhangs so I ran the Z-Hop option and that helped tremendously. My printer is just over a year old so I didn't think the pulleys were out of whack. Thanks though for all of your suggestions.

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    Posted · Mid-Print X/Y Problem
    7 hours ago, Futz34 said:

    Hi guys, yes there were a lot of steep overhangs so I ran the Z-Hop option and that helped tremendously. My printer is just over a year old so I didn't think the pulleys were out of whack. Thanks though for all of your suggestions.

     

    My S5 was about 7 days old when the pulleys went out of whack :)

    Screws loosen over time through vibration, especially small ones ( & especially those that aren't tight in the first place!!!). Although it may not be the problem, a periodic retightening of the screws is recommended by ultimaker. That's why they supply the 2mm allen tool with the machines.

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