diff --git a/BtlGeomProc.cpp b/BtlGeomProc.cpp
index 5b8c188..37b1ac1 100644
--- a/BtlGeomProc.cpp
+++ b/BtlGeomProc.cpp
@@ -7052,7 +7052,7 @@ BtlGeom::CreateOneCurveFreeContour( const ICurveComposite* pCrvCompo)
    double dThick ;     pCrvCompo->GetThickness( dThick) ;
   // Se ci sono lati con angolo di fianco
    if ( VerifyFreeContourCurveSideAng( pCrvCompo)) {
-      const double ADD_LEN = 500 ;
+      const double ADD_LEN = max( 500., 2 * abs( dThick)) ;
      // verifico se curva aperta o chiusa
       bool bClosed = pCrvCompo->IsClosed() ;
      // vettore delle superfici trimesh
diff --git a/EgtExchange.rc b/EgtExchange.rc
index e5b9638..4cc3541 100644
Binary files a/EgtExchange.rc and b/EgtExchange.rc differ