I know I could make a mesh of triangles, but I want it to fit exactly in the cut surface, without possible rounding errors: union { cylinder { <0,-12,0>, <0,-18,0>, 6 open } cylinder { <0,-12,0>, <0,-20,0>, 4 open } disc { <0,-20,0>, <0,1,0>, 8, 4 } (...) (22 years ago, 9-Dec-02, to lugnet.cad.ray)
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