How can I troubleshoot the 'Labels not in printer' error when using non-Dymo label rolls with my Dymo 550?

The Dymo 550 is designed primarily for use with Dymo-branded labels, and the sensor can be more sensitive to non-Dymo rolls. Ensure the label roll is seated correctly and try a hard reset of the printer. Sometimes, adjusting the label size slightly in the Dymo Connect software (e.g., a small increase or decrease) can trick the sensor. If using non-Dymo labels persists, consider using Dymo's compatible rolls, which are guaranteed to work, or researching alternative solutions, such as firmware hacks.