Epson recommends cleaning the thermal head periodically (generally every 3 months) to maintain receipt print quality.
Note: After printing, the thermal head can be very hot. Do not touch it and let it cool before you clean it. Do not damage the thermal head by touching it with your fingers or any hard object.
Turn off the printer and open the printer cover. Clean the thermal elements of the thermal head with a cotton swab moistened with an alcohol solvent (ethanol or IPA).
Close the printer cover and turn the printer back on.
Conduct a test print to check for quality. Step 1 on that page will guide you through it.
If after you conduct a test print, the receipt printing quality has not improved, please contact CAKE Support.