The print head is not pressing evenly on the 9-inch wide surface. Fix: This is a hardware issue, but the driver can help. Reduce the Print Speed to 2 IPS in the driver. Increase the Heat/Darkness setting from 15 to 22. This slows the label down, allowing the heat to penetrate the media evenly.

Years later, the alley kids would whisper about the driver who fixed lives with small boxes. They'd press their ears to the cold brick and say, almost reverent, "Look—there goes Label 9x10."