Prusaslicer: Support generated even if support on build only activated

[kakou-fr]

Version

slic3r-1.40.0-alpha1+

Operating system type + version

OS X 10.13.4

Behavior

Slic3r generate strange support in this hole, even if support on build only activated.

Expected behaviour : support only on build plate

STL/Config (.ZIP) where problem occurs

[3Delights]

I think the supports system is in need of a major rewrite!

[chadwixk]

Same issue on windows version 1.40.0-b. But this was also an issue on 1.38.4. Even though Support on build plate only is selected, it is producing support on the object itself.

[aaronevers]

I see this too.

thistle.zip
config.zip

Windows 7
Slic3r 1.40.0+win64,

[gromain]

Same problem seen here as well, when slicing a simple sphere with a cut on the bottom (as an example).

Support on build plate only is selected, and I see two problems:

• Useless support is generated (See the part on the right, goes at an angle then stop)
• Support material is generated above sliced part inside the sphere

support_test_0.2mm_PLA_MK3.amf.zip

Linux with Slic3r PE 1.41.0+linux64 from AppImage