Include Ability to Export to FedEx/Kinkos or other Printer

If you are able to partner with a company in which they can receive the file and the print it in the sizes that you need - that will allow for this to be used not only for small businesses but for large businesses as well. If they had an account with say FedEx/Kinkos, they could enter the account information, and it would automatically upload the file to be printed. After payment terms are worked out - they can pick it up or have it delivered.