Spiralize - Z seam - Geometry dependant

[greens83 5]

Im really hoping some of the very knowledgeable and helpful people I've come across on here before might be able to help me out with a problem I keep encountering with spiralize.

 

I do a lot of single wall printing using surfaces as geometry and the spiralize setting. Works really well 95% of the time. However on certain models I still get a z seam using spiralize. At first I thought this was the same issue as a previously identified X,Y, small travel inserted on each layer but that is now resolved in Cura.

 

This is definitely related to Z seam (If I tell cura where I want the z seam this issue goes there). It only appears on some models. Plain cylinders for instance never produce this. Here's a screen shot of what I'm talking about:

 

Smooth contour does something but it still is visible after printing.

 

Things I've observed:

 

It seems to occur more on shorter prints more (i.e. low z height).

 

If I stretch the same model up it will reduce the z seam and eventually disappear when it gets tall enough.

 

However really short cylinders don't produce this problem at all. So its not just the height that creates it.

 

Resolution of mesh has no effect on it.

bezel push fit 2.stl

none of the z seam options get rid of it. (but will move it)

 

Smooth outer contour doesn't get rid of it.

 

 

Any suggestions or input would be hugely appreciated. I need to eradicate the issue as I'm trying to start a business selling products that are heavily dependant on using Cura and spiralize. I am considering trying some other slicers but I don't really want to If I can avoid it.

 

Thanks in advance for anyone who can chime in with suggestions or any experience of this same issue.

 

Also attached is g-code and stl shown.

 

 

UM2E_bezel push fit 2.gcode

[ahoeben 1,948]

This model is non-manifold. Cura expects models to be manifold. Read https://github.com/Ghostkeeper/SettingsGuide/blob/master/resources/articles/troubleshooting/missing_parts.md#non-manifold-meshes

[greens83 5]

@ahoeben thank you for your reply. Interesting I've not seen this manifold info. I'm not sure this is the problem though. There's no geometry within geometry, its just a symmetrical revolved surface. If I make a cylindrical surface the same dimensions as the part I've previously shown I don't get the same problem.

 

[greens83 5]

I've also just tried making the geometry a water tight volume/solid rather than a revolved surface. Still the same problem with the z seam. So its not down to it being a surface or non-manifold. Thank you for the suggestion though.

 

[greens83 5]

This is now solved. If you are looking for the answer its over on this thread on page 3.