Vase mode artifacts

[Samon 0]

I'm having a problem when generating a gcode in vase mode of a model in which multiple planes meet in one point.

Cura 3.4.1 generates artifacts coming out from the vertices where the planes meet.

 

Is there any way to resolve that?

 

Thank you!

PART.stl

[burtoogle 514]

Hello @Samon, I cannot reproduce the issue, please save the project file and attach it.

[Samon 0]

Here you go @smartavionics

hex.curaproject.3mf

[burtoogle 514]

Hi @Samon, thanks for the project. Yes, I can see there's a problem in that region but I don't know what's causing it. If you turn off the spiralize smoothing and make the wall lines really thin you can see that there is a region where the wall doubles back on itself. As far as I can tell that's not in the original model so it's being caused by Cura. I shall try to find out what's happening.

 

[Samon 0]

 

2 minutes ago, smartavionics said:

As far as I can tell that's not in the original model

 

You're right, it's parametric design consisting only of surfaces (triangles) built on points, there's no double walls whatsoever.

 

Thank you for your help ?

[burtoogle 514]

Hi @Samon, I haven't actually printed the vase but I am fairly sure that the flaws that you see are just in the Cura layer view and not actually in the gcode. The Cura layer view doesn't really understand spiralized prints and the display has some problems and I think that is what you are seeing. I looked at the gcode using a couple of other viewers and couldn't see any problems. If you print it and it really does have any missing or extra line segments, please let me know. Cheers.

[Samon 0]

I can see these weird lines in Cura, S3D and Repetier.

 

I will print it and send the results ?

CCR10_hex.gcode

[Samon 0]

Now this is crazy.

 

First of all the mentioned artifacts are present and highly visible on the print.

Whats more the whole thing is wavy, and for sure that's not the printers fault because I have tried to print it previously with S3D.

 

(White - sliced with Cura, black - S3D)

 

Help ? ?

 

CCR10_hex.curaproject.3mf

[burtoogle 514]

Oh, you mean, those lines! Turn off the smooth spiralized contours option and they should go away.

 

With smoothing option enabled:

 

 

Without smoothing option enabled:

 

 

The smoothing option is intended to be used when the vertical profile does not have sharp edges. It's effective at hiding the z-seam when the object is basically smooth but it can introduce artifacts like you see in this example.

 

[Samon 0]

The problem still occurs but in different places now... ?

 

Is there any hope?

[Samon 0]

The only thing that "gets it right" is Surface mode of "Surface".

But then the extruder then has many backward travels, which to me is against the idea of "vase mode".

I don't think I understand the differences in Surface mode modes. 

Could someone explain it to me please?

I'm desperate to embrace Cura ?

[burtoogle 514]

Ignore any glitches you see in the cura layer view, like I said above, it doesn't really work well for spiral mode.

 

As for the wonky gcode lines in your s3d image, I found that setting the cura slicing tolerance to "exclusive" helped reduce the wonkiness! You might also want to play with the Maximum Resolution setting.