A printhead assembly includes a printhead. In one embodiment, a method includes generating a radiation of a laser-light created by a laser diode of a first medical instrument. A cable end seating is arranged between the first and second housings. An estimate of the range for the vehicle is determined based on the time of day and the amount of energy available. At least one electrically energizable energy emitter array is attached to the body for use in identifying the location of the guide relative to the adjacent vertebrae. The housing base is prepared by sheet metal forming, while the auxiliary components are prepared by die-casting, thixo molding or forging.