Cause analysis and solution:

1. The voltage used for printing is too low, for example, a 24V printer uses a 12V power supply;

2. Improve the printing effect by increasing the printing density and reducing the paper feeding speed;

3. Clear print head (need tools: cotton swab, alcohol);

4. Replace with better paper;

Read recommendations:

Portable Inkjet Printers

Handheld thermal printer Factory