[Xaccers]

Remember, the HP or whatever thing you have on your desk which spurts out paper is not a printer (now entering the microsoft zone) it is a print device.
The printer is the window that comes up when you double click the printer icon.
Now, all print devices are different, so they have different print drivers, which converts the document into a format that the print device understands and gives you the outcome you want.
So, if you do a print to file, it takes your document, converts it into a format specific for your model of print device and then saves it somewhere on your hard drive.

Open up your printers folder and drag the saved file to the printer.

Alas you aren't likely to be able to print them off a diferent printer.

See, what you should have done is installed the drivers for the laser print device at work, selected that printer and done print to file.
Then take the file into work and it'll be able to print on the laser print device.