diff --git a/Icarus/MaterialDb/Material.vb b/Icarus/MaterialDb/Material.vb
index d14cd41..e5a5eb0 100644
--- a/Icarus/MaterialDb/Material.vb
+++ b/Icarus/MaterialDb/Material.vb
@@ -215,6 +215,7 @@ Public Class MaterialIndex
 
    Friend Function GetSelMaterialData(Param As MaterialParam.Params) As Double
       Dim sParamKey As String = ""
+      Dim dDefault As Double = 0
       Select Case Param
          Case MaterialParam.Params.T1
             sParamKey = MAT_T1
@@ -228,8 +229,10 @@ Public Class MaterialIndex
             sParamKey = MAT_T5
          Case MaterialParam.Params.K_EXTRUSION
             sParamKey = MAT_KEXTRUSION
+            dDefault = 100
          Case MaterialParam.Params.K_LAY_TIME
             sParamKey = MAT_KLAYERTIME
+            dDefault = 100
          Case MaterialParam.Params.C1
             sParamKey = MAT_C1
          Case MaterialParam.Params.C2
@@ -255,7 +258,7 @@ Public Class MaterialIndex
          Case MaterialParam.Params.KN
             sParamKey = MAT_KN
       End Select
-      Return ReadMaterialParamDouble(m_nIndex, sParamKey, 0)
+      Return ReadMaterialParamDouble(m_nIndex, sParamKey, dDefault)
    End Function
 
 End Class
diff --git a/Icarus/SceneHost/MySceneHostVM.vb b/Icarus/SceneHost/MySceneHostVM.vb
index ce7caa2..7d0d6a9 100644
--- a/Icarus/SceneHost/MySceneHostVM.vb
+++ b/Icarus/SceneHost/MySceneHostVM.vb
@@ -508,8 +508,8 @@ Public Class MySceneHostVM
          .Title = "Export",
          .Filter = "Stereolithography (*.stl)|*.stl" &
                    "|3D Manufacturing format (*.3mf)|*.3mf",
-         .FilterIndex = 0,
-         .FileName = Path.ChangeExtension(MainController.GetCurrFile(), "stl")
+         .FilterIndex = 1,
+         .FileName = Path.ChangeExtension(MainController.GetCurrFile(), "3mf")
       }
       Dim DialogResult As Boolean? = SaveFileDialog.ShowDialog
       If IsNothing(DialogResult) OrElse Not DialogResult Then Return
diff --git a/Icarus/Utility/LuaExec.vb b/Icarus/Utility/LuaExec.vb
index c1d3340..76cc0f3 100644
--- a/Icarus/Utility/LuaExec.vb
+++ b/Icarus/Utility/LuaExec.vb
@@ -10,6 +10,7 @@ Module LuaExec
       If bSlice Then
          EgtLuaCreateGlobTable("PRINT")
          EgtLuaSetGlobIntVar("PRINT.PROGRAM", 1)
+         EgtLuaSetGlobStringVar("PRINT.BASEDIR", Map.refMainWindowVM.MainWindowM.s3dPrintingDir)
          bOk = bOk AndAlso EgtLuaExecFile(Map.refMainWindowVM.MainWindowM.s3dPrintingDir & "\Slicing.lua")
          ' Cancello tavola globale
          EgtLuaResetGlobVar("PRINT")
@@ -29,6 +30,9 @@ Module LuaExec
             dMachiningConstant = MachiningConstant.dValue
          End If
       End If
+      EgtLuaCreateGlobTable("PRINT")
+      EgtLuaSetGlobIntVar("PRINT.PROGRAM", 1)
+      EgtLuaSetGlobStringVar("PRINT.BASEDIR", Map.refMainWindowVM.MainWindowM.s3dPrintingDir)
       EgtLuaCreateGlobTable("MACHINING")
       EgtLuaSetGlobNumVar("MACHINING.K", dMachiningConstant)
       EgtLuaCreateGlobTable("MATERIAL")
@@ -49,17 +53,14 @@ Module LuaExec
       ' Eseguo lo script
       If EgtLuaExecFile(sExecPath) Then
          bOk = True
-         '' Recupero i risultati
-         'Dim nErr As Integer = 999
-         'EgtLuaGetGlobIntVar("MATERIAL.ERR", nErr)
-         'bOk = (nErr <= 0)
-         'If Not bOk Then EgtOutLog("ExecSlice Err=" & nErr.ToString())
       Else
          EgtOutLog("Error executing Slice Exec script " & sExecPath)
          bOk = False
       End If
       ' Cancello tavola globale
       EgtLuaResetGlobVar("MATERIAL")
+      EgtLuaResetGlobVar("MACHINING")
+      EgtLuaResetGlobVar("PRINT")
       Return bOk
    End Function
 
@@ -68,6 +69,7 @@ Module LuaExec
       ' eseguo generazione
       EgtLuaCreateGlobTable("PRINT")
       EgtLuaSetGlobIntVar("PRINT.PROGRAM", 1)
+      EgtLuaSetGlobStringVar("PRINT.BASEDIR", Map.refMainWindowVM.MainWindowM.s3dPrintingDir)
       Dim sIsoFilePath As String = ""
       Dim nTabPartId As Integer = EgtGetFirstNameInGroup(GDB_ID.ROOT, TABLE)
       If nTabPartId <> GDB_ID.NULL Then
@@ -98,6 +100,8 @@ Module LuaExec
       EgtOutLog("-- Start ExecSolid --")
       ' eseguo generazione
       EgtLuaCreateGlobTable("PRINT")
+      EgtLuaSetGlobIntVar("PRINT.PROGRAM", 1)
+      EgtLuaSetGlobStringVar("PRINT.BASEDIR", Map.refMainWindowVM.MainWindowM.s3dPrintingDir)
       Dim bOk As Boolean = EgtLuaExecFile(Map.refMainWindowVM.MainWindowM.s3dPrintingDir & "\CalcSolids.lua")
       If bOk Then
          Dim nErr As Integer = 999