The Dymo 450 is a great printer, and you can definitely use it with Pirate Ship!
Just head to Settings > General Settings and change your Label Size to 2x7". Keep in mind that you must set your label size before you create any labels, or else you'll have to go back and refund them if you accidentally purchase the wrong size.
Please note that Dymo printers are not compatible with Chromebooks 🙈
Running into any issues? Just chat with us, we're happy to help!