Vase mode causes overhangs for some model widths

[ofmetal]

Description of the bug

I have created a simple cookie cutter form, simple pentagon (test1.obj). Prusa Slicer 2.7.0 generates ugly stuff, shows blue overhangs, and warns regarding stability issues. If I slightly tune the model, the problem goes away: 1) change enforcement layers width from 1.7mm to 2.0mm (test2.obj) 2) replacing pentagon with square (test3.obj) I have created minimal test to reproduce this problem. Attached a screenshot, the 3 above obj files, openscad project to generate these objs, and 3mf prusa project file with all 3 models included.

Project file & How to reproduce

Slice in vase mode. Notice, 1 object has ugly blue overhangs, the 2 other objects are good. Nozzle 0.6, perimeters width 0.85, bottom layers 8. vasebug.zip

Checklist of files included above

• [x] Project file
• [X] Screenshot

Version of PrusaSlicer

Version 2.7.0+win64

Operating system

win10x64

Printer model

Flyingbear Ghost 6

[ofmetal]

[kaizoor]

I came here since I have the same problem with a project. That it generates overhangs mid part. I downloaded your project and was able to reproduce the issue when importing everything. If I used only the parts itself with my config together the gcode was fine.

This is the issue appearing in my project: Project files: Diffuser.zip

Version of PrusaSlicer

Version 2.7.1+linux-x64-GTK3

Operating system

Debian 12 Bookworm

Printer model

Sovol SV06 Plus

[ofmetal]

Another time faced this problem, now with v2.7.2 Simple cylinder. Vase mode. There is no way to remove this blue overhang. cyl_bug.zip