diff --git a/LuaLibs/CalcToolPath.lua b/LuaLibs/CalcToolPath.lua
index 044f650..76e7858 100644
--- a/LuaLibs/CalcToolPath.lua
+++ b/LuaLibs/CalcToolPath.lua
@@ -2102,19 +2102,19 @@ local function CalcRibsToolPath( vEntIds, nRibsGrp, nTpathGrpId, LayerParams)
    if nType == RIB_TYPE.UNBOUNDED then
       bForceNoSolidBorder = true
    end
-   local nCrvRib = EgtGetNext( nLastEnt)
-   while nCrvRib do
-      -- verifico se necessario lead in
-      local nPrev = EgtGetPrev( nCrvRib)
-      if not nPrev or EgtGetName( nPrev) ~= LINK_CRV then
-         AddRibsLeadIn( nCrvRib, nLoopGrp, LayerParams.vtSlicing, nGrpTmp, bForceNoSolidBorder, bSpecialCase)
+   for i = 1, #tabRibs do
+      for j = 1, #tabRibs[i] do
+         -- verifico se necessario lead in
+         local nPrev = EgtGetPrev( tabRibs[i][j])
+         if not nPrev or EgtGetName( nPrev) ~= LINK_CRV then
+            AddRibsLeadIn( tabRibs[i][j], nLoopGrp, LayerParams.vtSlicing, nGrpTmp, bForceNoSolidBorder, bSpecialCase)
+         end
+         -- verifico se necessario lead out
+         local nNext = EgtGetNext( tabRibs[i][j])
+         if not nNext or EgtGetName( nNext) ~= LINK_CRV then
+            AddRibsLeadOut( tabRibs[i][j], nLoopGrp, LayerParams.vtSlicing, nGrpTmp, bForceNoSolidBorder, bSpecialCase)
+         end
       end
-      -- verifico se necessario lead out
-      local nNext = EgtGetNext( nCrvRib)
-      if not nNext or EgtGetName( nNext) ~= LINK_CRV then
-         AddRibsLeadOut( nCrvRib, nLoopGrp, LayerParams.vtSlicing, nGrpTmp, bForceNoSolidBorder, bSpecialCase)
-      end
-      nCrvRib = EgtGetNextName( nCrvRib, RIBS_CRV .. '*')
    end
    
    EgtErase( nGrpTmp)