You could change the default printer, then change it back.
To get the printer:
cscript %windir%\system32\Printing_Admin_Scripts\en-US\prnmngr.vbs -g
To set it:
cscript %windir%\system32\Printing_Admin_Scripts\en-US\prnmngr.vbs -t -p "\Servername\printername"
Unfortunately, the first returns it in the form: "The default printer is PrinterName" so you'll have to separate it out.
(And on some earlier versions of windows the script is located in %windir%\system32\ )