The printer head used in the Nemonic Label printer is capable of printing approximately at least 20km long.
However, if used for a long time, the printer head may get contaminated and printouts may be affected, so clean it regularly.
Make sure to turn off the power and unplug the power cord before cleaning.
Open the cover. The printer head is the black strip part in the main body.
It may be very hot right after printing, so be careful.
Moisten a cotton swab with alcohol and wipe the print head with it.