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Layer Shift after 7 hour pause


Julian2801
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Posted (edited) · Layer Shift after 7 hour pause

Hey. 

 

I'm having a bit of trouble when I'm pausing a print over night (due to long print times and I can't really sleep with my printer printing 6 metres from my bedroom). 

 

When I resume the print in the next morning there often is a 1mm offset to the right from the old and the new layer. Can I do something against it? 

 

 

Edited by Julian2801
fixed typo
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    Posted · Layer Shift after 7 hour pause

    Hmmmm, ok....I wonder if something is knocking the plate over a bit.

     

    When the printer goes into pause, it homes the printhead to the front left (from facing the printer) and then goes to the back right. Is there anything like that, that you see when resuming?

     

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    Posted · Layer Shift after 7 hour pause

    The bed stays hot the whole 7 hours, right?  Because you don't want the bed to cool - if it does the part will likely come loose enough to look like a shift.

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    Posted · Layer Shift after 7 hour pause
    2 hours ago, gr5 said:

    The bed stays hot the whole 7 hours, right?  Because you don't want the bed to cool - if it does the part will likely come loose enough to look like a shift.

    Would that not happen during a long term print? Why would the printhead sitting still while the buildplate is hot be different from regular long term printing?

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    Posted · Layer Shift after 7 hour pause
    14 hours ago, gr5 said:

    The bed stays hot the whole 7 hours, right?  Because you don't want the bed to cool - if it does the part will likely come loose enough to look like a shift.

    Yeah, the bed stays hot during the pause. I will try it again and see if it will happen again. Maybe I was just unlucky....

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    Posted · Layer Shift after 7 hour pause

    Another possibility:

     

    Someone in the German forum mentioned recently that there may be a firmware bug. He said that there's an offset of the print position after resuming - depending on the active print core. There where no details about which axis or by which amount though... He just said, the pause function on the UM3 is useless for him because of this.

    If you use both print cores and if it is reproducible, you discovered perhaps the same issue?

     

    Source: https://community.ultimaker.com/topic/24343-2-düsen-2-layerhöhen/?tab=comments#comment-218498

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    Posted · Layer Shift after 7 hour pause

    I have not noticed this on my machines. And I have paused on both printcores for various reasons.

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    Posted · Layer Shift after 7 hour pause

    07CCBEAD-000C-45E6-843D-2D76EBC822D6.thumb.jpeg.7c4e6d9fb377ee77d720c94c3d2d04d8.jpeg

     

    It looks like this for me after every pause longer than 2 hours... 

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    Posted · Layer Shift after 7 hour pause

    Is it a layer shift for sure?  or just an underextruded layer?  An underextruded layer would make more sense as it was dripping for a while - you could lift the lever on the feeder and slide some more filament in just before you start - but not too much or it will overextrude I think.  For normal loading of filament I slide it in until it stops then back off about 1cm.  Not sure how much to back off on a "resume" as I've never tried it on a UM3.

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    Posted (edited) · Layer Shift after 7 hour pause
    34 minutes ago, gr5 said:

    Is it a layer shift for sure?  or just an underextruded layer?  An underextruded layer would make more sense as it was dripping for a while - you could lift the lever on the feeder and slide some more filament in just before you start - but not too much or it will overextrude I think.  For normal loading of filament I slide it in until it stops then back off about 1cm.  Not sure how much to back off on a "resume" as I've never tried it on a UM3.

    I‘m sure that this is a layer shift because the following layers stay like this the whole print without going back to the „normal“ position.

    Edited by Julian2801
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