diff --git a/EXE_GdbModifyCurve.cpp b/EXE_GdbModifyCurve.cpp
index 1b49edf..02071ef 100644
--- a/EXE_GdbModifyCurve.cpp
+++ b/EXE_GdbModifyCurve.cpp
@@ -196,6 +196,8 @@ ExeApproxCurve( int nId, int nApprType, double dLinTol)
         nApprType == APP_RIGHT_LINES  ||  nApprType == APP_RIGHT_CONVEX_LINES) {
       PolyLine PL ;
       bOk = bOk && pCurve->ApproxWithLines( dLinTol, ANG_TOL_MAX_DEG, nApprType, PL) && pCC->FromPolyLine( PL) ;
+     // eliminazione di small Z
+      bOk = bOk && pCC->RemoveSmallDefects( 0.5 * dLinTol, ANG_TOL_STD_DEG) ;
    }
    else {       // con bi-archi
       PolyArc PA ;
@@ -207,8 +209,10 @@ ExeApproxCurve( int nId, int nApprType, double dLinTol)
          dAngTol = min( ANG_TOL_STD_DEG + 0.2 * dCoeff * ANG_TOL_STD_DEG, ANG_TOL_MAX_DEG) ;
       }
       bOk = bOk && pCurve->ApproxWithArcsEx( dLinTol, dAngTol, dLinFea, PA) && pCC->FromPolyArc( PA) ;
+     // eliminazione di small Z
+      bOk = bOk && pCC->RemoveSmallDefects( 0.5 * dLinTol, ANG_TOL_STD_DEG) ;
      // merge di archi identici di biarchi
-      bOk = bOk && pCC->MergeCurves( 0.5 * dLinTol, dAngTol) ;
+      bOk = bOk && pCC->MergeCurves( 0.5 * dLinTol, ANG_TOL_STD_DEG) ;
    }
   // copio estrusione e spessore
    Vector3d vtExtr ;
diff --git a/EgtExecutor.rc b/EgtExecutor.rc
index f9fdf09..7c3e315 100644
Binary files a/EgtExecutor.rc and b/EgtExecutor.rc differ