VBScript Code to Assign a Default Printer Based on Queue Length
You can use any of the VBScript programs below in ActiveXperts Network Monitor. Click here for an explanation about how to include scripts in ActiveXperts Network Monitor.
Example(s)
intSmallestQueue = 1000
strComputer = "."
Set objWMIService = GetObject("winmgmts:" _
    & "{impersonationLevel=impersonate}!\\" & strComputer & "\root\cimv2")
Set colPrintQueues =  objWMIService.ExecQuery _
    ("Select * from Win32_PerfFormattedData_Spooler_PrintQueue " _
        & "Where Name <> '_Total'")
For Each objPrintQueue in colPrintQueues
    intCurrentQueue = objPrintQueue.Jobs + objPrintQueue.JobsSpooling
    If intCurrentQueue <= intSmallestQueue Then
        strNewDefault = objPrintQueue.Name
        intSmallestQueue = intCurrentQueue
    End If
Next
Set colInstalledPrinters =  objWMIService.ExecQuery _
    ("Select * from Win32_Printer Where Name = '" & strNewDefault & "'")
For Each objPrinter in colInstalledPrinters
    objPrinter.SetDefaultPrinter()
Next
    