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Strange slicing


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Posted · Strange slicing

Hi!

 

So I've encountered what I think is a strange behaviour in Cura. When I try to slice a thin cylinder which I intended to use for tuning wipe and coasting settings, I found that the generated travel path is weird, after printing one layer it travels the whole path again without extruding. The following gif should show what I mean. This is sliced with the default "Fine" profile without any changes made to it. I also tried with disabling different things such as wipe and retraction without any effect. The wall thickness of the cylinder is 0.455mm.

MboN33O.gif

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    Posted · Strange slicing

    It's caused by a feature called "combing".  You want combing off for this part.  It's combing the long way around.  The combing feature used to be a bit smarter about going the shorter way around.  In fact I thought this bug was only in cura 3.X.  Not Cura 4.X.

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    Posted · Strange slicing

    Actually, I think what is happening is that the wall overlap compensation is enabled and because the wall is thin, the resulting 2nd wall contains very little filament. To stop the pointless travel set the minimum wall flow value to something like 50 (or even higher) and it should stop that pointless travel occuring.

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    Posted · Strange slicing

    Thanks for the answer!

     

    I've tried turning off combing as well and it still passes over a second time. In the following gif you can see the result when turning off combing, wiping and retraction just to try to remove all possible causes that could make the slicer want the printer to travel the extra distance. The z-seam is set to user specified so that all layer changes line up as well.

     

    Ivrhsx5.gif

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