diff --git a/EgtMachKernel.rc b/EgtMachKernel.rc
index b8f154e..1de3b0b 100644
Binary files a/EgtMachKernel.rc and b/EgtMachKernel.rc differ
diff --git a/Milling.cpp b/Milling.cpp
index 76c70dc..fc7b936 100644
--- a/Milling.cpp
+++ b/Milling.cpp
@@ -782,6 +782,10 @@ Milling::GetCurve( SelData Id)
          const ICurve* pOriCurve = ::GetCurve( pGObj) ;
          if ( pOriCurve != nullptr)
             pCurve.Set( pOriCurve->Clone()) ;
+        // se estrusione mancante, imposto default
+         Vector3d vtExtr ;
+         if ( ! pCurve->GetExtrusion( vtExtr)  ||  vtExtr.IsSmall())
+            pCurve->SetExtrusion( Z_AX) ;
       }
       // altrimenti sottocurva di composita
       else {
@@ -794,8 +798,9 @@ Milling::GetCurve( SelData Id)
                pCurve.Set( pOriCurve->Clone()) ;
               // recupero estrusione e spessore
                Vector3d vtExtr ;
-               if ( pCompo->GetExtrusion( vtExtr))
-                  pCurve->SetExtrusion( vtExtr) ;
+               if ( ! pCompo->GetExtrusion( vtExtr)  ||  vtExtr.IsSmall())
+                  vtExtr = Z_AX ;
+               pCurve->SetExtrusion( vtExtr) ;
                double dThick ;
                if ( pCompo->GetThickness( dThick))
                   pCurve->SetThickness( dThick) ;