1, maybe the print head is dirty or broken;
2. The printing software and driver version are too low;
3. The printer sensor is not calibrated;
4. The typesetting is not arranged well, and the set width is wrong. You can see what kind of situation it belongs to and adjust it;
5. The paper size software setting is not in place;
6. Let the printer check the paper before and after;
7. The motherboard or driver is abnormal. In the horizontal direction, the pressure of the print head may be uneven-the toner on the print head accumulates-or the print head is damaged.