Hi JohnMiranda
Does the printer print in small font when printing a Word document?
Word is most likely defaulting to the wrong driver which is causing the small print.
Make sure the printer is set as the default printer.
Go to start, devices and printers, right click the printer and set it as the default
printer. Close the Word Software and reopen it again.
Now try and print. Make sure the correct printer is selected.
Try printing the envelope again.
Let me know if that works.