A cartridge is provided with a supply housing having at least one exterior surface defining a supply area adapted to receive a donor ribbon of predetermined width and a take-up housing having a main wall that defines a take-up area for receiving donor ribbon of predetermined width. A take-up projection on the take-up housing and the main wall jointly define a take-up window therebetween through which donor ribbon passes into the take-up area. The take-up projection includes at least one tensioning feature so as to pre-load the take-up projection such that the take-up projection is inhibited from warping toward towards the main wall.