CAD tip # 13911:

Sub Main
    'Print all sheets in your Inventor drawing document
    If ThisApplication.ActiveDocument.DocumentType = kDrawingDocumentObject Then
        Dim oDrwgDoc As DrawingDocument
        oDrwgDoc = ThisApplication.ActiveDocument
        
        Dim oDrwgPrintMgr As DrawingPrintManager
        oDrwgPrintMgr = oDrwgDoc.PrintManager
        ' Set the printer name
        ' Printer name: comment this line to use the default printer or assign your own
        oDrwgPrintMgr.Printer = "Microsoft Print to PDF" ' "HP LaserJet 4000 Series PCL 6"
        
        'Set the paper size , scale and orientation
        oDrwgPrintMgr.ScaleMode = kPrintBestFitScale ' kPrintFullScale
        oDrwgPrintMgr.PaperSize = kPaperSizeA4
        oDrwgPrintMgr.PrintRange = kPrintAllSheets ' ALL SHEETS, or kPrintCurrentSheet or kPrintSheetRange
	'oDrwgPrintMgr.GetSheetRange(1,3) ' if Range
        oDrwgPrintMgr.Orientation = kLandscapeOrientation
	oDrwgPrintMgr.ColorMode = kPrintDefaultColorMode ' kPrintGrayScale
	oDrwgPrintMgr.NumberOfCopies = 1
	oDrwgPrintMgr.Rotate90Degrees = False
	oDrwgPrintMgr.AllColorsAsBlack = False
	oDrwgPrintMgr.RemoveLineWeights = False
	oDrwgPrintMgr.TilingEnabled = False
        oDrwgPrintMgr.SubmitPrint
    Else
	MsgBox("Not a drawing!")
    End If
End Sub