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Default supports, bridge infill layer runs same direction as support interface layer #7940

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@GaryAitken

Description

@GaryAitken

Version

2.4.G+linux-x64-GTK3

Operating system type + version

ubuntu 21.10 5.13.0-28-generic

3D printer brand / version + firmware version (if known)

Prusa MK3S firmware 3.10.1

Behavior

Slice the .3mf file, then examine the bridge infill layer and the support interface layer immediately below it. They are running in the same direction. The option for bridge infill angle is set to zero, the default; as is the pattern angle for the supports.

Expected behavior: the bridge infill layer should run perpendicular, or at least not parallel to, the top support layer.
Actual behavior: they run in the same direction.

More discussion are found here:
#https://forum.prusaprinters.org/forum/prusaslicer/help-deciphering-support-and-bottom-layer-structure/#post-582391
Bad_Plate_FLEX.zip
Slicer_b
Slicer_a

Is this a new feature request?
No

Project File (.3MF) where problem occurs

Upload a PrusaSlicer Project File (.3MF) (Plater -> Export plate as 3MF for Slic3r PE 1.41.2 and older, File -> Save / Save Project for PrusaSlicer, Slic3r PE 1.42.0-alpha and newer)
Images (PNG, GIF, JPEG), PDFs or text files could be drag & dropped to the issue directly, while all other files need to be zipped first (.zip, .gz)

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