Inconsistency in Bridge anchor area

[qwewer0]

OrcaSlicer Version

1.9 Beta/Alpha, 1.8.1, 1.8

OS version

Windows 10

Additional system information

No response

Printer

Ender 3

How to reproduce

Updated info #3413 (comment)

1. Open Slicer (1.9 Alpha/Beta, 1.8.1, 1.8 or pull request 3285 by igiannakas)
2. Open the project file
3. Turn off the Ensure vertical shell thickness setting
4. Slice plate
5. Go to layer 82
6. See the bridge anchor area

The last version was 1.7 when it worked normally.

Actual results

The ends of the bridges are only anchored to the part with a single wall thickness.

Expected results

The ends of the bridges should be anchored to the part with the number of wall lops. (or at least with more than 1 wall thickness)

Project file & Debug log uploads

Cube Bridge.zip

Checklist of files to include

• Log file
• Project file

[igiannakas]

In my PR above have you tried with the new option enabled? Further reduce solid infill?

[qwewer0]

In my PR above have you tried with the new option enabled? Further reduce solid infill?

Yes, but it's the same with or without.

[igiannakas]

Reproduced; however this is not a bug - it's the legacy behaviour which is triggered when ensure vertical shell thickness is turned off. Not sure if this needs a fix or not- I printed a similar bridging test and the bridges were successful.

[qwewer0]

Reproduced; however this is not a bug - it's the legacy behaviour which is triggered when ensure vertical shell thickness is turned off. Not sure if this needs a fix or not- I printed a similar bridging test and the bridges were successful.

My printer is in pieces right now, but I too will test it and close this if it works just fine.

[qwewer0]

I did a few slicer tests - printer is still broken - and found something interesting:

I cut down the cube in the project file to only have a single layer at the bridging area. Cube Bridge - Cut.zip
Then checked with no top and 1 or 2 bottom layers, with Ensure vertical shell thickness still turned on.

As we can see below, a single bottom layer will cause the same problem with the bringing anchor area.
So, while having the Ensure vertical shell thickness turned off does change the default bridging behavior, it isn't the main cause of the problem.

Single bottom layer:

Two bottom layers:

[qwewer0]

Did a test print and it not only looks fine but it's strong too, so there is nothing to worry about.

While I still think that this slicing inconsistency will need to be checked in the future, for now, it works just fine.

@igiannakas Thanks for the check-in, and for being awesome. 🌟
Keep it up, and have a great day.