[5.9.0] Inside to Outside Wall Ordering Not Respected When Optimize Wall Order is False

[mzhu1113]

Cura Version

5.9.0

Operating System

NA

Printer

NA

Reproduction steps

A thin wall feature that is not thick enough for infill to be generated.
When Inside to Outside is selected bit Optimize Wall Order is false, the outer walls will be printed first instead of the inner. This affects models where there were only a single inner wall; have not seen this happen where more than 1 nozzle width of inner walls are made.

You can reproduce by creating a rect prism that would be 3 nozzle widths (thus generating an outer wall plus a single inner wall).

Actual results

The outer wall gets printed first.

Expected results

The inner wall to be printed first despite whether Optimize Wall Printing Order is True/False.

There's cases for some recent jobs we've printed where Optimizations negatively impacted the print but this behavior is also undesired.

Add your .zip and screenshots here ⬇️

[GregValiant]

Thanks for the report.
I can duplicate this. It appears that the behavior starts when it goes from "back-to-back inner walls", to the "single inner wall" condition shows up.

The Cura team will take a look.
20147.zip