diff --git a/LuaLibs/CalcToolPath.lua b/LuaLibs/CalcToolPath.lua
index 83ca22c..ef804e3 100644
--- a/LuaLibs/CalcToolPath.lua
+++ b/LuaLibs/CalcToolPath.lua
@@ -88,10 +88,10 @@ end
 
 ------------------------------------------------------------------
 local function AddZCorrection( b3Box, LayerParams)
-   
+   -- nel caso multiplanare non è necessaria alcuna correzione
    local nSlicingType = EgtGetInfo( s_nPartId, KEY_SLICING_TYPE, 'i')
    if nSlicingType == SLICING_TYPE.MULTIPLANAR then
-      LayerParams.vtSlicing = Z_AX()
+      return
    end
    
    local dNxy = sqrt( LayerParams.vtSlicing:getX() * LayerParams.vtSlicing:getX() + LayerParams.vtSlicing:getY() * LayerParams.vtSlicing:getY())