Error when rendering an imported stl and mix with primitives

[FVivolo]

ERROR: CGAL error in CGAL_Nef_polyhedron3(): CGAL ERROR: assertion violation! Expr: e->incident_sface() != SFace_const_handle() File: /opt/mxe/usr/x86_64-w64-mingw32.static/include/CGAL/Nef_S2/SM_const_decorator.h Line: 326

please let eme know to send you an example

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[t-paul]

Please check the FAQ which has some tips.

Does "crash" mean the application actually crashes, or is it giving the error message above in the output window.

[FVivolo]

sorry the application not crash this is a log in the console side when the render is requested

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After fixing the stl using 3dBuilder it does not show the crash in the console log, but the object is not rendered

test code

module piece(){
off=[0,-300,0];
translate(off)
    import("fan_exporter_002.stl", convexity=3);
}

translate ([-15, -40, 6]) cube([4, 2, 8], center = true);
scale([1,1,0.8]) piece();

here the model after fix using 3dBuilder
https://drive.google.com/file/d/0B8W2ouqsL7KYSDlocTR3YjNCSVU/view?usp=sharing

[kintel]

We have a number of related issues, so this is most likely a duplicate, just don't know exactly which one yet: https://github.com/openscad/openscad/issues?q=is%3Aissue+is%3Aopen+label%3A%22Mesh+Repair%22

[kintel]

Closing as duplicate of "some known existing issue". Also: Manifold is expected to behave better in the vast majority of cases.