Using a negative value for horizonal expansion causes infill to not generate in thin walls

[5o6]

Cura Version

5.8.1

Operating System

Windows 10

Printer

Ender 3 (Klipper, All-metal hotend, z probe)

Reproduction steps

Slice a model with thin walls (less than 3mm) with a horizonal expansion value under 0 (-0.05 in my case). Notice missing infill.

Actual results

Infill does not generate within the walls

Expected results

Infill should generate within the walls

Add your .zip and screenshots here ⬇️

CE3PRO_Bolt Pinning Jig - Imperial.zip

[GregValiant]

Thanks for the report.
I don't think this really had anything to do with Horizontal Expansion other than it dropped the size of the "model feature" below a point that affected the infill generator filter. This looks like a duplicate of #19478 (and #19802).
A repair has been made in 5.9.0-beta.2.
This is layer 455 in 5.8.1

And this is layer 455 in 5.9.0-beta.2 (the beta.1 release does not have this fix in it).

I'll mark this as a duplicate and go ahead and close it. I hope you understand.

[5o6]

Thanks for the quick response, I'll go ahead and use the beta for now then.