Let's say I have a document I'd like to print at a public business center, but I don't want to use a USB drive or access any of my personal or business accounts on the public PC (e.g. dropbox, email, etc.). The document itself is sufficiently non-confidential to access and print on the public PC, but not so much that I would publish it openly on the public web.
Create a new online storage account and upload the file there. Then access it and print it on the print shop computer and then reset the password on that account so that the print shop computer can no longer access it.