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Guide slot of print head
Gently move the print head along its guide slot out (do not
damage the cabling to it and never do this when print head is
still hot), you can clean the thermal elements of the print head
using a cotton swab moistened with alcohol solvent (ethanol,
methanol, IPA)
NOTE: Do not touch the print head thermal elements
Do not scratch the print head
Before re-assuming the print head position, alcohol solvent
should be dried completely.
Thermal elements