The tech went on to explain that Dymo’s current printers, the 450 series, do work fine with OS X 10.9.4. The problem was limited to just a “few older models,” of which mine was one.

Dymo's USB-connected, thermal-label printers enable you to print postage, address packages, identify files and documents, and create name badges, all from your desktop or notebook computer. The ...

The firmware on a Dymo printer can fall under copyrighted work. Firstly, I am not sure that law holds any water in this scenario, Apple was not able to stop Hacintosh or Cydia. Secondly, that's ...