Canon Mk1500 Cable and Wire Marker Printer - Manual (Page 15)

11
Safety Precautions
Do not feed wires into the unit
The purpose of this unit is to print on tube or labels. This unit cannot
print directly on wires or cables, so do not attempt to feed wires or
cables into the unit. Doing so could result in damage to the unit.
Do not touch the connector (metal part)
Do not touch the connection terminal (metal part) of the cassette. Doing
so could cause an improper recognition of the cassette.
Do not leave the machine unused for a long time
Do not leave the printer in a sun-heated vehicle or any other extreme environment for an extended period.