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Doubling up on layers bad for cooling

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Posted · Doubling up on layers bad for cooling

I noticed that sometimes Cura doubles up on the layers, I guess this is for speed. For example it will do two layers at once on a isolated feature, before moving on to the next feature.

But this is bad for cooling, and doesn't satisfy the "minimum layer time" setting. When I have a part with some tricky overhangs and things like that it makes me have to run the print slower than I otherwise would need to.

I also noticed that if I'm printing a round part with radial features it will double up the layers on one of the features every time it goes around. There is a noticable reduction in quality on this one feature because it didn't get the same cooling time as the others.

Is there a way to disable this? If not any hints as to where I might find this in the code?

Thanks!

 

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Posted · Doubling up on layers bad for cooling

These two parts printed at the same time, same orientation. The only difference is that the slicer decided to double up the layers on one of them

P1010092.JPG

P1010084.JPG

 

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Posted · Doubling up on layers bad for cooling

This doubling up problem is somewhat unintentional I think, it's just the path optimizer not caring about the layer change.

I've come up with a patch to solve this problem, testing it now.

 

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Posted · Doubling up on layers bad for cooling

This doubling up problem is somewhat unintentional I think, it's just the path optimizer not caring about the layer change.

 

This.

It's pretty much an unintentional side-effect. It's also almost the only dependency that other layers have on each-other in the export gcode step. Making it easier to multi-thread the engine one day.

 

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Posted · Doubling up on layers bad for cooling

Can we then assume that this behaviour will not be changed in future versions?

 

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Posted · Doubling up on layers bad for cooling

From my very short experience with the UMO+, I have seen the same. When some layers have a small "island", Cura 14.12 prints the "island" last in one layer, and first in the next layer. This seriously degrades the quality of the "island" part.

I assumed this was an attempt to reduce the number of retractions, but anyway, it does not seem to be good for the print quality.

 

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Posted · Doubling up on layers bad for cooling

Can we then assume that this behaviour will not be changed in future versions?

 

If you mean "I just accepted the patch that changes this behavior"? then yes.

 

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Posted · Doubling up on layers bad for cooling

Thanks Daid!

@IRobertI, I think what Daid is saying is that the patch reduces the interlayer dependence, which will make multi-threading easier in the future, and that's a good thing.

 

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Posted · Doubling up on layers bad for cooling

Looks like I misunderstood the post by daid. To me it sounded like the way it was being done now was a good thing for future multi threading and would therefore remain in place.

 

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Posted · Doubling up on layers bad for cooling

Looks like I misunderstood the post by daid. To me it sounded like the way it was being done now was a good thing for future multi threading and would therefore remain in place.

 

No, the fix is good for multi-threading.

Actually, the fix is so good. That I left it in place for the 14.12.1 hotfix release.

EDIT: Download it from http://software.ultimaker.com/

 

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Posted · Doubling up on layers bad for cooling

Excellent news. This has bugged me for quite some time, glad to see it's being fixed :)

 

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