diff --git a/LuaLibs/AddManData.lua b/LuaLibs/AddManData.lua
index 03392e8..b029731 100644
--- a/LuaLibs/AddManData.lua
+++ b/LuaLibs/AddManData.lua
@@ -92,7 +92,6 @@ KEY_RIBS_TWO_STRANDS = "RibsHaveAll2Strands"
 -- Regioni con diverso numero di passate
 KEY_SHELL_NBR_DIFF = "ShellNbrDifference"
 KEY_INVERTED_CURVE = "CurveIsInverted"
-KEY_CLOSED_EXTRA_SHELL = "ExtraShellIsClosed"
 
 -- Parametri di macchina
 SEC_3DPRINTING = "3dPrinting"
diff --git a/LuaLibs/CalcPaths.lua b/LuaLibs/CalcPaths.lua
index 1f6cb60..e1fbb9c 100644
--- a/LuaLibs/CalcPaths.lua
+++ b/LuaLibs/CalcPaths.lua
@@ -265,7 +265,7 @@ local function AdjustRibsOffsetForIntersection2Shells( nCrv1, nCrv2, LayerParams
       EgtErase( vCopy1[i])
    end
 end
-   
+
 --------------------------------------------------------------------
 local function HandleRibsIntersections( nRibsGrp, LayerParams, nOffsGrp, nRibsPathGrp, bAllTwoStrands)
    
@@ -379,7 +379,6 @@ local function ReorderRibs( nGrp, bInvertOrder, dStrand, nMaxNbr)
          end
       end
    end
-   
 end
 
 --------------------------------------------------------------------------------------------
@@ -543,8 +542,6 @@ local function ReorderRibsInters2Shells( nOffsGrp, dStrand)
    ReassignInfo( nCrv, nCnt, vCopy)
 end
 
-
-
 --------------------------------------------------------------------
 local function CalcRibsPaths( nSliceGrp, nRibsGrp, LayerParams, nIdx, nMaxStrandDiff)
 
@@ -781,7 +778,7 @@ local function UpdateTotalShellSurf( nSrf, nCrv, dStrand, nGrpId)
 end
 
 ---------------------------------------------------------------------
-local function JoinAndReorderExtraShells( nPathGrp, dStrand, vPtStart)
+local function ReorderExtraShells( nPathGrp, dStrand, vPtStart)
   
    local vIds = EgtGetNameInGroup( nPathGrp, EXTRA_SHELL_CRV .. '*')
    if not vIds then return end 
@@ -858,28 +855,6 @@ local function JoinAndReorderExtraShells( nPathGrp, dStrand, vPtStart)
          end
       end
    end
-   
-   -- verifico se posso realizzare percorsi chiusi
-   for i = 1, k do
-      local vIds = EgtGetNameInGroup( nPathGrp, EXTRA_SHELL_CRV .. tostring(i))
-      if #vIds == 2 then
-         local ptS = EgtSP( vIds[1])
-         local ptE = EgtEP( vIds[2])         
-         if dist( ptS, ptE) < 1.5 * dStrand then
-            EgtAddCurveCompoLine( vIds[1], EgtSP( vIds[2]))
-            EgtAddCurveCompoCurve( vIds[1], vIds[2])
-            EgtCloseCurveCompo( vIds[1])
-            -- modifico lo start point
-            ModifyStartPoint( vIds[1], vPtStart)
-            -- ripristino se necessario orientamento antiorario
-            if EgtGetInfo( vIds[1], KEY_INVERTED_CURVE, 'b') then
-               EgtInvertCurve( vIds[1])
-               EgtSetInfo( vIds[1], KEY_INVERTED_CURVE, 0)
-            end
-            EgtSetInfo( vIds[1], KEY_CLOSED_EXTRA_SHELL, 1)
-         end
-      end  
-   end
 end
 
 --------------------------------------------------------------------
@@ -917,7 +892,7 @@ local function VerifyExtraShellPath( nCrv, nGrpId, vtSlicing, dStrand)
       EgtRelocateGlob( nCrv, nGrpId, GDB_IN.LAST_SON)
       EgtErase( nGrpTmp)
    end
-      
+
    return true
 end
 
@@ -977,7 +952,7 @@ local function CalcExtraShellsPath( nMaxShellNbrDiff, nShellNbrGrp, nCrvGrpId, d
                               for j = nCrvT + 1, nTrimCrv + nTrimCnt - 1 do
                                  EgtErase( j)
                               end
-                              JoinAndReorderExtraShells( nGrpId, LayerParams.dStrand, vPtStart)
+                              ReorderExtraShells( nGrpId, LayerParams.dStrand, vPtStart)
                               return
                            end
                         else
@@ -993,8 +968,8 @@ local function CalcExtraShellsPath( nMaxShellNbrDiff, nShellNbrGrp, nCrvGrpId, d
    end
    
    -- riordino le curve appena create e se possibile creo percorsi chiusi
-   JoinAndReorderExtraShells( nGrpId, LayerParams.dStrand, vPtStart)
-  
+   ReorderExtraShells( nGrpId, LayerParams.dStrand, vPtStart)
+
 end
 
 ---------------------------------------------------------------------
diff --git a/LuaLibs/CalcToolPath.lua b/LuaLibs/CalcToolPath.lua
index 96eabfc..02e81e6 100644
--- a/LuaLibs/CalcToolPath.lua
+++ b/LuaLibs/CalcToolPath.lua
@@ -208,13 +208,12 @@ local function AddRetraction( nCrvId, dCoastingLen, dWipeLen, vtSlicing)
       -- se shell
       local nWipeId
       local nType = EgtGetInfo( nCrvId, KEY_TYPE, 'i')
-      local bClosedExtraShell = EgtGetInfo( nCrvId, KEY_CLOSED_EXTRA_SHELL, 'b') or false
-      if nType == TYPE.OUTER_SHELL or nType == TYPE.INNER_SHELL or bClosedExtraShell then
-         -- se shell o extra shell chiusa
+      if nType == TYPE.OUTER_SHELL or nType == TYPE.INNER_SHELL then
+         -- se shell
          nWipeId = EgtCopyGlob( nCopyId, nCoastingId or nCrvId, GDB_IN.AFTER)
          EgtTrimCurveEndAtLen( nWipeId, dWipeLen)
       else
-         -- se extra shell aperta
+         -- se extra shell
          local bInverted = EgtGetInfo( nCrvId, KEY_INVERTED_CURVE, 'b') or false
          local vtDir = EgtEV( nCoastingId or nCrvId)
          vtDir:rotate( vtSlicing, EgtIf( bInverted, 90, -90))
@@ -745,10 +744,6 @@ function CalcToolPath.Exec( nPartId)
 
          -- aggiungo gli opportuni raccordi sulle shell complete
          local vIds = EgtGetNameInGroup( nTpathGrpId, SHELL_CRV .. '*')
-         local vIdsExtra = EgtGetNameInGroup( nTpathGrpId, EXTRA_SHELL_CRV .. '*') or {}
-         for i = 1, #vIdsExtra do
-            table.insert( vIds, vIdsExtra[i])
-         end
          AddLink( vIds, nTpathGrpId, LayerParams.nLinkType, LayerParams.dLinkParam, LayerParams.dSPOffs, LayerParams.dStrand, LayerParams.vtSlicing)
          
          -- aggiungo gli opportuni raccondi sulle shell con numero diverso di passate         
@@ -769,7 +764,6 @@ function CalcToolPath.Exec( nPartId)
             nCurr = EgtGetNextName( nCurr, EXTRA_SHELL_CRV .. '*')
          end
          
-         
          -- aggiungo leadin/leadout
          local nFirstCurve = EgtGetFirstInGroup( nTpathGrpId)
          if nFirstCurve and LayerParams.nLeadInType ~= LEAD_TYPE.NONE then