Put this in your ThisWorkbook code module (right-click on the
workbook title bar and select View Code):
Private Sub Workbook_BeforePrint(Cancel As Boolean)
Dim wkSht As Worksheet
For Each wkSht In ActiveWindow.SelectedSheets
wkSht.PageSetup.LeftFooter = ActiveWorkbook.Path
Next wkSht
End Sub
This will then update every time you print or print preview.