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You receive an error message stating "Unable to select Printer "Printer Name" - Failed to access print parameters" or there are no Printers available in the dropdown list.


This error indicates that one of the printers on the machine has a problem printer driver or permissions issues that is preventing us access to all the printer information or that the system has no "default" printer or there is a problem with the Windows WMI system. The way the Revit Print API works is that we ask it what printers are available on the machine, then we set the printer appropriate as per the format settings. However, if any of the printers on the system give us an error, the Revit Print API enters an error state and even if you aren't using that Printer, they all will fail with that message. Only a restart of Revit will clear the error.