If the toner chips/flakes off of your labels, it will usually mean the incorrect setting is being used or the label is not designed to work with the toner for the MF644. We would be happy to assist with the issue. To provide some feedback or some troubleshooting steps, we would need some additional information. If you could reply to this message with the information below, we can provide some assistance. For a more immediate resolution, you can contact support at 1-800-652-2666. our agents would be happy to assist.