"Warning ... print stability", Collapsing overhang - material removed with Negative Volume

prusa3d / PrusaSlicer

G-code generator for 3D printers (RepRap, Makerbot, Ultimaker etc.)

https://www.prusa3d.com/prusaslicer/

GNU Affero General Public License v3.0

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"Warning ... print stability", Collapsing overhang - material removed with Negative Volume #13712

Open blillesand opened 18 hours ago

blillesand commented 18 hours ago

Description of the bug

Material removed with negative volume flags warning about collapsing overhang. This is does not occur in Prusaslicer 2.8

Project file & How to reproduce

1) Add part (block) that spans opening in model. 2) Add negative volume to clear section of part (from step 1) from the opening 3) Slice

Checklist of files included above

[ ] Project file
[ ] Screenshot

Version of PrusaSlicer

2.9.0 Alpha 1

Operating system

Windows 11 64 bit

Printer model

Prusa XL 5H

blillesand commented 17 hours ago

The Rocket Xmas card - final XL - Copy.txt

File extension should be renamed to 3mf. Was changed to txt to allow it to be attached.

u89djt commented 16 hours ago

(Intrigued fellow user) Confirming the spurious warning, and that it doesn't attempt to support it if you enable supports And letting OP know that zipping the 3mf works: The.Rocket.Xmas.card.-.final.XL.-.Copy.zip

blillesand commented 14 hours ago

Sorry for any confusion, I believe the issue is with these negative volumes (found on all sizes - 100%, 85%, and 75%). The negative volume in the prior comment is only on the 75% size.