diff --git a/LuaLibs/AddManData.lua b/LuaLibs/AddManData.lua
index ff56ca8..2aefe40 100644
--- a/LuaLibs/AddManData.lua
+++ b/LuaLibs/AddManData.lua
@@ -102,6 +102,7 @@ KEY_INFILL_TYPE = 'InfillType'
 KEY_INFILL_DENSITY = 'InfillDensity'
 KEY_INFILL_LINK = 'InfillLink'
 KEY_INFILL_OVERLAP = 'InfillOverlap'
+KEY_INFILL_STRAND_OVERLAP = 'InfillStrandOverlap'
 KEY_INFILL_GRID_OVERLAP = 'InfillGridOverlap'
 KEY_INFILL_DIR = 'InfillDirection'
 KEY_INFILL_OFFSET_X = 'InfillOffsetX'
diff --git a/LuaLibs/CalcPaths.lua b/LuaLibs/CalcPaths.lua
index 7f08e8c..49ea9f3 100644
--- a/LuaLibs/CalcPaths.lua
+++ b/LuaLibs/CalcPaths.lua
@@ -51,6 +51,7 @@ local function GetLayerParamsForPathCalc()
    if LayerParams.dInfillStrand < GEO.EPS_SMALL then LayerParams.dInfillStrand = LayerParams.dStrand end
    LayerParams.bInfillLink = EgtGetInfo( s_nPartId, KEY_INFILL_LINK, 'b') or false
    LayerParams.dInfillOverlap = EgtGetInfo( s_nPartId, KEY_INFILL_OVERLAP, 'd') or 0
+   LayerParams.dInfillStrandOverlap = EgtGetInfo( s_nPartId, KEY_INFILL_STRAND_OVERLAP, 'd') or 0
    LayerParams.nInfillType = EgtGetInfo( s_nPartId, KEY_INFILL_TYPE, 'i') or FILL_TYPE.NONE
 
    -- eventuale modifica dei parametri per gestire correttamente il caso spiral vase
@@ -657,22 +658,15 @@ local function GetZigZagDirection( nSrfId, nBorderSurf, dStrand, nGrp, frLoc, nT
    
    -- verifico se ho direzione definita nei layer precedenti
    local nPrevSlice = EgtGetPrevName( nSliceLayId, SLICE_LAYER .. '*')
-   local nPrevPrevSlice = EgtGetPrevName( nPrevSlice or GDB_ID.NULL, SLICE_LAYER .. '*')
-   if nPrevPrevSlice then
-      vtDir = EgtGetInfo( nPrevPrevSlice, sInfoKey, 'v')
+   if nPrevSlice then
+      vtDir = EgtGetInfo( nPrevSlice, sInfoKey, 'v')
    end
    
-   if not vtDir then
-      -- se è definita sul layer precedente la ruoto di 90° rispetto a Z ( visto che siamo in un frame locale a vtSlicing) altrimenti la calcolo in modo che sia quella ottimale
-      if nPrevSlice then
-         vtDir = EgtGetInfo( nPrevSlice, sInfoKey, 'v')
-         if vtDir then
-            vtDir:rotate( Z_AX(), 90)
-         end
-      end
-      if not vtDir then
-         vtDir = FindOptimalZigZagDirection( nSrfId, nBorderSurf, dStrand, nGrp, frLoc)
-      end
+   -- se è definita sul layer precedente la ruoto di 90° rispetto a Z ( visto che siamo in un frame locale a vtSlicing) altrimenti la calcolo in modo che sia quella ottimale
+   if vtDir then
+      vtDir:rotate( Z_AX(), 90)
+   else
+      vtDir = FindOptimalZigZagDirection( nSrfId, nBorderSurf, dStrand, nGrp, frLoc)
    end
 
    EgtSetInfo( nSliceLayId, sInfoKey, vtDir)
@@ -741,7 +735,7 @@ local function CalcSolidFillPath( nLayId, LayerParams, nStartLay, nFillType)
             end
             
             -- distanza tra passate tenendo conto dell'overlap indicato
-            local dDist = ( 1 - LayerParams.dStrandOverlap / 100) * LayerParams.dInfillStrand
+            local dDist = ( 1 - LayerParams.dInfillStrandOverlap / 100) * LayerParams.dInfillStrand
             -- inserisco il riempimento
             if nFillType == FILL_TYPE.OFFSET then
                -- recupero le shell precedenti dal PathGrp