extra perimeter on overhangs starts in the air

[SphaeroX]

Description of the bug

The print starts here in the air, if it would start properly at the print part then one could print very well in the air like for example with ArcOverhangs

Project file & How to reproduce

09_support.zip

Open with 2.6 Alpha

Checklist of files included above

• [X] Project file
• [X] Screenshot

Version of PrusaSlicer

Version 2.6.0-alpha2+win64

Operating system

Win 11

Printer model

custom

[kubispe1]

Thanks for your issue. We are working on fix.

[Godrak]

We have fixed the issue where the extra perimeter connected on a wrong spot to the previous perimeter and then the pattern broke. This could happen especially when there is a single extrusion line gap fill as last extrusion, as in your example. The extrusions should also not break in the air as happened in your example.

However, as for the extrusions starting in the air, this can still happen, and it is usually signal that you should enable supports. The extra perimeters feature is not supposed to allow printing of big overhangs without supports. It reduces the amount of supports needed (with supports autopaint tool), tries to avoid unanchored bridges in the air and improves the surface quality.