diff --git a/LuaLibs/AddManData.lua b/LuaLibs/AddManData.lua
index 1cba96b..7c1b826 100644
--- a/LuaLibs/AddManData.lua
+++ b/LuaLibs/AddManData.lua
@@ -179,6 +179,8 @@ KEY_COEFF_Y = "CoeffY"
 KEY_SPEED_MIN = "SpeedMin"
 KEY_SPEED_MAX = "SpeedMax"
 KEY_FEED_MAX = 'FeedMax'
+KEY_LINEAR_APPROX = 'LinearApprox'
+KEY_LINEAR_TOL = 'LinearTol'
 
 -- Altre chiavi
 KEY_MAX_H = "SlicingHeight"
diff --git a/LuaLibs/CalcToolPath.lua b/LuaLibs/CalcToolPath.lua
index 3c09076..c3fe505 100644
--- a/LuaLibs/CalcToolPath.lua
+++ b/LuaLibs/CalcToolPath.lua
@@ -55,6 +55,11 @@ local function GetLayerParamsForToolPathCalc()
    LayerParams.dInfillCoasting = EgtGetInfo( s_nPartId, KEY_INFILL_COASTING, 'd') or 0
    LayerParams.dInfillWipe = EgtGetInfo( s_nPartId, KEY_INFILL_WIPE, 'd') or 0
    LayerParams.dInfillWipeDir = EgtGetInfo( s_nPartId, KEY_INFILL_WIPE_DIR, 'd') or 0
+   
+   -- parametri dal file macchina per eventuale approssimazione lineare dei percorsi
+   local sMachIni = EgtGetCurrMachineDir() .. '\\' .. EgtGetCurrMachineName() .. '.ini'
+   LayerParams.bLinearApprox = ( EgtGetNumberFromIni( SEC_3DPRINTING, KEY_LINEAR_APPROX, 0, sMachIni) == 1)
+   LayerParams.dLinearApproxTol = EgtGetNumberFromIni( SEC_3DPRINTING, KEY_LINEAR_TOL, 0.1, sMachIni)
 
    return LayerParams
 end
@@ -346,6 +351,8 @@ local function AddLeadIn( nCrvId, LayerParams, nGrpId)
       local dStrand = EgtGetInfo( nCrvId, KEY_CRV_STRAND, 'd')
       EgtSetInfo( nLeadInCrv, KEY_CRV_STRAND, dStrand)
    end
+   
+   return nLeadInCrv
 end
 
 --------------------------------------------------------------------
@@ -1990,6 +1997,9 @@ local function AddSpiralVaseLeadOut( nOldId, LayerParams)
       EgtTrimCurveEndAtLen( nOldId, EgtCurveLength( nOldId) - LayerParams.dOffsetLP)
       local nLeadOut = AddLeadOut( nOldId, LayerParams, EgtGetParent( nOldId))
       if nLeadOut then
+         if LayerParams.bLinearApprox then
+            EgtApproxCurve( nLeadOut, GDB_CA.LINES, LayerParams.dLinearApproxTol)
+         end
          local dDelta = LayerParams.dLayHeight / EgtCurveLength( nOldId) * EgtCurveLength( nLeadOut)
          EgtSpiralizeCurveAlongExtrusion( nLeadOut, dDelta)
       end
@@ -2090,10 +2100,18 @@ local function SpiralVase( vLayIds, LayerParams)
                local nNewPart = EgtSplitCurveAtParam( nNewEntId, dTrimPar)
                EgtSpiralizeCurveAlongExtrusion( nNewPart, 0.5 * LayerParams.dLayHeight)
                
+               if LayerParams.bLinearApprox then
+                  EgtApproxCurve( nNewEntId, GDB_CA.LINES, LayerParams.dLinearApproxTol)
+                  EgtApproxCurve( nNewPart, GDB_CA.LINES, LayerParams.dLinearApproxTol)
+               end
+               
                -- eventuale lead in
                if LayerParams.nLeadInType ~= LEAD_TYPE.NONE then
                   EgtTrimCurveStartAtLen( nNewEntId, LayerParams.dOffsetLP)
-                  AddLeadIn( nNewEntId, LayerParams, nTpathGrpId)
+                  local nLeadInCrv = AddLeadIn( nNewEntId, LayerParams, nTpathGrpId)
+                  if nLeadInCrv and LayerParams.bLinearApprox then
+                     EgtApproxCurve( nLeadInCrv, GDB_CA.LINES, LayerParams.dLinearApproxTol)
+                  end
                end
             else
                local ptOld = EgtEP( nOldId, GDB_ID.ROOT)
@@ -2103,7 +2121,7 @@ local function SpiralVase( vLayIds, LayerParams)
                end
                local ptNew = EgtSP( nNewEntId, GDB_ID.ROOT)
                -- modifico la curva per avere una transizione più uniforme tra i due layers
-               if EgtCurveCompoRadius( nNewEntId, 0) == -1  and dist( ptOld, ptNew) / EgtCurveCompoLength( nNewEntId, 0) < s_dSpiralVaseTanTol then
+               if EgtCurveCompoRadius( nNewEntId, 0) == -1 and dist( ptOld, ptNew) / EgtCurveCompoLength( nNewEntId, 0) < s_dSpiralVaseTanTol then
                   -- se i punti sono abbastanza vicini e la curva inizia con un tratto lineare sufficientemente lungo allora distribuisco la differenza tra i
                   -- due layer solo sul primo tratto
                   EgtModifyCurveStartPoint( nNewEntId, ptOld, GDB_RT.GLOB)
@@ -2132,11 +2150,15 @@ local function SpiralVase( vLayIds, LayerParams)
                -- approssimo
                local ptS = EgtSP( nNewEntId, GDB_ID.ROOT)
                EgtApproxCurve( nNewEntId, GDB_CA.ARCS, s_dApproxTol)
+               if LayerParams.bLinearApprox then
+                  EgtApproxCurve( nNewEntId, GDB_CA.LINES, LayerParams.dLinearApproxTol)
+               end
                if EgtCurveIsClosed( nNewEntId) then
                   EgtChangeClosedCurveStartPoint( nNewEntId, ptS, GDB_RT.GLOB)
                end
                
-               -- modifica graduale del'altezza
+               
+               -- modifica graduale dell'altezza
                if nRealLayer == 2 then
                   -- se seconda passata la prima metà deve essere a quota costante 0.5 * dLayHeight, la seconda metà deve salire gradualmente di 0.5 * dLayHeight
                   EgtMove( nNewEntId, 0.5 * LayerParams.dLayHeight * LayerParams.vtSlicing, GDB_RT.GLOB)
@@ -2321,6 +2343,15 @@ function CalcToolPath.Exec( nPartId)
             nLayCnt = nIdx
          end
          
+         -- eventuale approssimazione delle curve
+         if LayerParams.bLinearApprox then
+            local nCrvId = EgtGetFirstInGroup( nTpathGrpId)
+            while nCrvId do
+               EgtApproxCurve( nCrvId, GDB_CA.LINES, LayerParams.dLinearApproxTol)
+               nCrvId = EgtGetNext( nCrvId)
+            end
+         end
+         
          -- passo al gruppo di contorni successivo
          nCrvGrpId = EgtGetNextName( nCrvGrpId, CONTOUR_GRP.."*")
       end
diff --git a/Version.lua b/Version.lua
index bff7799..a9268a2 100644
--- a/Version.lua
+++ b/Version.lua
@@ -1,4 +1,4 @@
 -- Version.lua by Egaltech s.r.l. 2024/05/06
 -- Gestione della versione di 3dPrinting
 
-VERSION = '2.7d1'
\ No newline at end of file
+VERSION = '2.7f1'
\ No newline at end of file