Hello, please confirm the following points:
① Use industrial alcohol and cotton to clean the print head and roller, removing any dust.
② Inspect the roller for any signs of scratches or cuts, which may cause the print to be unclear at a fixed 360-degree position during printing. If so, replace the roller (contact after-sales service for assistance).
③ Check if the print head is damaged at a fixed position. If necessary, replace it with a new print head (contact after-sales service for assistance).