According to one aspect of the disclosed subject matter, a method for forming a monolithically isled back contact back junction solar cell using bulk wafers is provided. The maintenance assembly includes a car movably supported for travel along a maintenance path interposed between a first printhead and an ink receiving surface from a home position to a completion position and a wiper extending from the car for wiping the printhead front faces as the car moves along the path. A bolt mechanism having a bolt carrier and a bolt member and firing pin being located for reciprocating movement within the upper receiver.