Switching Printers

: I know this should be simple, but… I have a script that selects the
: PDFWriter from within FileMaker and it works flawlessly. Whenever I use
: the simple script to select the LaserWriter, FileMaker locks up. I changed
: the script and left out ‘tell FileMaker’ and ran the script from the
: Finder and it worked once. But, it now locks up the Finder whenever I try
: to switch from the PDFWriter to LaserWriter.

Try this:

tell application "Desktop Printer Manager"
	set default printer to desktop printer "My Printer"
end tell