Hello found my problem, my Laptop has no enough memory. I have Importe the upper part of the speak er as stl. It us running and cab be redndert very fast, perhaps couse made with openScad. So I selected Another stl File and did render. What I had to see was the spwaker part was missing and the elephan was there. Problem is clear now.Thanks for the replay. Helmut Deichmann  Von meinem Samsung Gerät gesendet. -------- Ursprüngliche Nachricht -------- Von: Parkinbot <rudolf@parkinbot.com> Datum: 31.01.18 22:29 (GMT+01:00) An: discuss@lists.openscad.org Betreff: Re: [OpenSCAD] openScad + STL cannot render OpenSCAD like most other programms doesn't make use of the normals at all. It recalcs them from the vertices. You can check that by rendering and exporting cube(10); e.g. to my.stl. Open the STL with an editor and modify the normals as you like. Then import the result and check: import("my.stl"); cube(1); -- Sent from: http://forum.openscad.org/ _______________________________________________ OpenSCAD mailing list Discuss@lists.openscad.org http://lists.openscad.org/mailman/listinfo/discuss_lists.openscad.org