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sadpunk

Sharpest corner + Hide seam: Improvement needed?

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Hi!

I'm trying the Z seam aligment: Sharpest corner + Hide seam to improve my prints.

But I am getting mixed results.

It looks like Cura, sometimes ignores this options and places the seam randomly, making the scars more noticeable.

Below there's an example of a 3Dbenchy.

3Dbenchy.PNG.8226709031fdbcf3701bf26a2704366a.PNG

I believe that the seam should be on either of the corners (black arrows) and not on a straight line (black circle)

Please note:

I'm on cura 3.0.4

I print "outer before inner walls" + "infill After wall"

Thanks!

3Dbenchy.PNG.8226709031fdbcf3701bf26a2704366a.PNG

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Hi, if you want the seam to be on the "pointy bits" of the outline you should use "expose seam" and then it will locate the seam on the most convex curve of the outline.

However, at the moment it is suboptimal inasmuch as it bases the curvature calculation only on the curve between adjacent points on the outline which makes it very sensitive to outlines that are not smooth. It would probably be better if it averaged the curvature over some distance. Perhaps, I shall take a look at that...

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For a cylindrical shape like that you will get best results using the User Specified z-seam alignment along with some suitable x/y values. This will align the z-seam across layers. However, you can still specify a seam corner preference and what that does is move the z-seam from the position that it would have given the x/y values and the shape of the part to a nearby convex or concave corner. You can even control how much influence the corner will have on the z-seam position by varying the x/y values (while keeping the ratio of x to y the same). The larger the values of x/y the more influence the corner will have. Have a play with it, there's quite a lot of control there.

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