There could be several reasons why a thermal print is getting blurry:
Worn-out print head: The print head is the component of a thermal printer that comes in contact with the thermal paper and applies heat to create the image. If the print head is worn out, it may not apply enough heat evenly, leading to blurry or faint prints.
Dirty print head: If the print head is dirty, it can cause the prints to become blurry. Dirt or debris on the print head can prevent it from making proper contact with the thermal paper, resulting in incomplete or uneven printing.
Low-quality thermal paper: The quality of the thermal paper can also affect the quality of the prints. Low-quality paper may not be able to handle the heat generated by the print head, leading to blurry prints.
Fading ink: Over time, the ink on the thermal paper can fade, resulting in blurry prints. This can happen if the paper is exposed to direct sunlight or high temperatures.
Printer settings: If the printer settings are not optimized for the type of paper being used, it can cause the prints to be blurry. Adjusting the darkness, contrast, or print speed settings may improve the print quality.
If you are experiencing blurry thermal prints, try cleaning the print head, using high-quality thermal paper, and adjusting the printer settings. If the problem persists, it may be time to replace the print head or consider purchasing a new printer.