Bridge settings not used with soluble support interface

flynny75 commented 2 months ago

Description of the bug

Slicer is not using bridging settings when using a 0 (soluble) support z distance. This is problematic when using PLA support in a PETG print and painting in support areas. Areas not supported are using solid infill settings rather than bridge settings.

Project file & How to reproduce

Have model that does bridging
Slice, see bridge parameters used in gcode preview
Paint on some support
Enable support for enforcers only
Change support top contact Z distance to 0 (soluble)
Enable support layer synchronisation (required)
Slice
Observe bridge areas are using solid infill settings

Checklist of files included above

[ ] Project file
[ ] Screenshot

Version of PrusaSlicer

2.8.0

Operating system

Windows 11

Printer model

XL 5TH

neophyl commented 2 months ago

Yes, that is the way its designed. By setting the distance to zero you are turning off bridging. This has been raised before iirc. Ah yes, a search turns up https://github.com/prusa3d/PrusaSlicer/issues/10939 https://github.com/prusa3d/PrusaSlicer/issues/8884 https://github.com/prusa3d/PrusaSlicer/issues/6868

As mentioned by Rtyr here https://github.com/prusa3d/PrusaSlicer/issues/6868#issuecomment-919949654 you should set a very small contact distance such as 0.01 if you want to keep PS using bridging.

flynny75 commented 2 months ago

Unfortunately that means I can't use tool 1 for the perimeter of the wipe tower, which is required for the structural integrity of the tower when using materials that do not adhere

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