too many travels

[Taxom]

Cura Version

5.5.0

Operating System

W10x64

Printer

Marlin

Reproduction steps

open .stl
slicing

Actual results

too many travels

Expected results

Less empty movements

Add your .zip and screenshots here ⬇️

UPS.zip

video_2023-12-12_18-36-21.mp4

[Asterchades]

There are two factors at play here.

First appears to be a Combing issue. I believe this is related to #14511, and it looks to be exacerbated by the use of Avoid Printed Parts When Traveling creating some very long (and frankly erroneous) travel paths. This can be mostly cleaned up to varying degrees by using Not in Skin, All, or None, or by disabling Avoid Printed Parts When Traveling.

Second is the use of a Top Surface Skin Layer. Even though the properties appear to be set identically, this causes the very top layer/s of any skin to be treated as a separate feature to any other skin. Particularly with the lettering this can result in a lot of additional travels to both avoid this feature and return to it later, and Combing (combined with Avoid Printed Parts When Traveling) makes things worse again. As you're not using different properties for these layers, setting the Top Surface Skin Layers to zero (0) should not only have no appreciable impact on print quality but removes all of the errant travel movements - even without changing the Combing setting.

[5axes]

Top Surface Skin Layers = 1

Top Surface Skin Layers = 0

[Taxom]

I often use Top Surface Skin Layers of Concentric.
I tried to change the Combing mode but it does not help.
But this is definitely a problem with Top Surface Skin Layers. Since the installation of parameter in 2 layers transfers the problem to the layer below. Is there any hope that this problem will be solved in the following updates? Since I often encounter this problem, even when there are not many details on the upper layer. Sorry for my English.