While helping patrons recover print jobs Sunday afternoon I noticed an interesting phenomenon: Every single user scanned his or her card, selected the job(s), and THEN inserted the money. This usually works out okay, but quite often, it doesn't.
The system is set to time-out 30 seconds after the card is scanned. This means that if you scan your card, pick your jobs, and spend a minute fumbling around for change, you might have to start over from the beginning.
My advice? When you send your print job, a few moments after you've named it, the cost computation will pop up in the lower right hand corner of the screen; remember the amount. When you approach the print release station, drop your money in the coin box first. Then, scan your card, select your job(s), and click the "print" button.
Follow these steps, your prints will be released, you'll be able to get back to work, and others won't have to stand in line while you fumble around for your card and change.