Slicing issue

[Rikolino24]

Cura Version

5.8.0

Operating System

Windows 11

Printer

homemade 3d printer

Name abnormal settings

No response

Describe model location

No response

Describe your model

Vase shape

Add your .zip here ⬇️

I use Cura with the 'spiralize outer contour' function to slice large circular parts in vase mode. However, during slicing, a 'ridge' forms on the part that I cannot eliminate. The error is barely noticeable when the layer height is less than 0.5 mm, but since I use a 3D printer to print concrete, I need a layer height of 10 mm. I would appreciate any help or advice to correct this issue.

Thank you in advance!

[GregValiant]

Post a project file and I'll look. When I spiralize models I use @smartavionics fork of Cura which has some nice touches for Spiralize. It's based on UM Cura 4.x. It may not be better, but it will likely be different.

[Rikolino24]

Thanks man, I really appreciate it

(https://www.reddit.com/r/TalesFromThePizzaGuy/comments/7b2p38/thanks_man_i_really_appreciate_it/) Matera cónica 59capas.zip

[GregValiant]

I set up my printer with a 20.0 nozzle, and 10.0 layer height and a 20.0 Line Width. This is in Cura MB 4.20.21. You can see the jig -jog in the upper layers.

This is hard to see but it's the Gcode from that slice read into AutoCAD. (I tried to catch the same viewing angle).

And this is the Gcode file opened in Cura MB

This is the Gcode file in the PrusaSlicer Gcode Viewer.

So I think it is a display glitch in the original preview because the jig-jog does not appear to show up in the Gcode file itself. The Cura preview does not show the gradual changes in the "Z" (everything is shown on a layer parallel to the build plate) and does not understand G2/G3 at all.

Are you seeing that aberration in the print?

[smartavionics]

Hi. The Cura layer view is the main culprit here. It has never been able to display spiralized gcode well because it cannot correctly display lines whose Z value differs from the Z value for the current layer. i.e. the displayed Z values cannot be between the layers so for a 10mm layer height Z, the Z values used for layer 2 will all be 20mm, whereas, the gcode will contain Z values that smoothly increase from 10mm to 20mm. Hope this makes sense.

[Rikolino24]

I'd like to show you how the piece looks after printing. With the current settings, the "ridge" that appeared in the Cura preview is also visible in the printed piece. However, I noticed that GregValiant doesn't have the same issue, as his print path looks clean. I'll now try Cura Master, as you recommended. Thank you very much!

[GregValiant]

I didn't find that jog in the gcodes I investigated. It is certainly in the preview but it's the gcode that counts.

You can use the PrusaSlicer "Gcode Viewer" (which is a separately installed app) and it will take Cura out of the loop when viewing a gcode file. It's what I used for the comparison shown above.

I just sliced this in UM Cura 5.8.0 and this is the Gcode in the Prusa Gcode Viewer. Looks good.

I don't think you are going to find a problem with the gcode so before wasting a print I suggest you sit down with a cold beverage and stare at the printer while swearing softly to yourself. It can't hurt and might even help.