diff --git a/LuaLibs/CalcPaths.lua b/LuaLibs/CalcPaths.lua
index 1761a85..0423498 100644
--- a/LuaLibs/CalcPaths.lua
+++ b/LuaLibs/CalcPaths.lua
@@ -3114,26 +3114,38 @@ end
 
 --------------------------------------------------------------------
 local function AdjustRibsMergedExtraShellLink( nLinkId, vExtraShells, nGrp)
-   
-   local frLoc = Frame3d( ORIG(), s_vtSlicing)
-   local nGrpLoc = EgtGroup( nGrp, frLoc)
+
    local vLinks = {}
    
-   -- devo conservare solo le intersezioni fra link ed extra shell
+   -- devo conservare solo i tratti comuni fra link ed extra shell
    for i = 1, #vExtraShells do
-      local nRes, nPntCnt, nCrvCnt = EgtCurveCurveInters( nLinkId, vExtraShells[i], nGrpLoc)
-      if nRes then
-         for nId = nRes + nPntCnt, nRes + nPntCnt + nCrvCnt - 1 do
-            EgtRelocateGlob( nId, nGrp)
-            EgtModifyCurveExtrusion( nId, s_vtSlicing, GDB_ID.ROOT)
-            table.insert( vLinks, nId)
+      
+      local dParS = EgtCurveParamAtPoint( nLinkId, EgtSP( vExtraShells[i]), 100 * GEO.EPS_SMALL)
+      local dParE = EgtCurveParamAtPoint( nLinkId, EgtEP( vExtraShells[i]), 100 * GEO.EPS_SMALL)
+      if dParS or dParE then
+         local nCrv = EgtCopyGlob( nLinkId, nGrp)
+         if dParS and dParE then
+            EgtTrimCurveStartEndAtParam( nCrv, dParS, dParE)
+         elseif dParS then
+            EgtTrimCurveStartAtParam( nCrv, dParS)
+         elseif dParE then
+            EgtTrimCurveEndAtParam( nCrv, dParE)
+         end
+         EgtModifyCurveExtrusion( nCrv, s_vtSlicing, GDB_ID.ROOT)
+         table.insert( vLinks, nCrv)
+      else
+         
+         -- verifico se il link originale è già corretto
+         local dPar1 = EgtCurveParamAtPoint( vExtraShells[i], EgtSP( nLinkId), 100 * GEO.EPS_SMALL)
+         local dPar2 = EgtCurveParamAtPoint( vExtraShells[i], EgtEP( nLinkId), 100 * GEO.EPS_SMALL)
+         if dPar1 and dPar2 then
+            return { nLinkId}
          end
       end
    end
    
    -- cancello il link originale
    EgtErase( nLinkId)
-   EgtErase( nGrpLoc)
    return vLinks
 end
 
diff --git a/Version.lua b/Version.lua
index 7f53c0f..41ef6af 100644
--- a/Version.lua
+++ b/Version.lua
@@ -1,4 +1,4 @@
 -- Version.lua by Egaltech s.r.l. 2025/09/12
 -- Gestione della versione di 3dPrinting
 
-VERSION = '2.7j1'
\ No newline at end of file
+VERSION = '2.7l1'
\ No newline at end of file