I have certain cases where invoices need to be printed and included with material being sent to a client. 

I have "Show Status Stamp" turned on inside the PDF template, Transaction Details tab.

When I create an invoice, I have choices to send, save and send later, and print. 

If I choose Print, I get a "Draft" stamp on the invoice.

The best option I've found is: choose print, cancel printing, mark invoice as sent, print again - which seems unnecessary. I really just want "Paid" to print on the invoice when applicable, and nothing otherwise.