OpenSCAD version 2019.05

When I import any one of:
Boot_Spant_2.3mf    previews  renders
Boot_Spant_3.3mf    previews  renders
Boot_Spant_23.3mf  previews  renders

all three together
Boot_Spant_2.3mf    previews only
Boot_Spant_3.3mf    previews only
Boot_Spant_23.3mf  previews only

two together
Boot_Spant_2.3mf    previews only
Boot_Spant_3.3mf    previews only

Boot_Spant_2.3mf    previews
Boot_Spant_23.3mf  previews CGAL error

Boot_Spant_3.3mf    previews
Boot_Spant_23.3mf  previews CGAL error

ERROR: CGAL error in CGAL_Nef_polyhedron3(): CGAL ERROR: assertion
violation! Expr: e_below != SHalfedge_handle() File:
/mxe/usr/x86_64-w64-mingw32.static.posix/include/CGAL/Nef_3/SNC_FM_decorator.h
Line: 426

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@lar3ry
you are right about the CGAL error.

I did try with some simple objects and it worked fine.

I also found out there is some construction fault in the exported files,
which is no problem for most program's, but is for CGAL
so i now suspect it had something to do with the way i constucted the spant.

i am now in painstaking the process of creating stl/off/3mf files of every
construction step and checking wich construction step causes the error.

i will keep you informed

rgrds
Henk

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