An ice cube maker has an ice tray, a thermoelectric cooling chip, a heat sink and a fan sequentially mounted together. The hinge assembly includes at least an elongated, hollow and partially open cylindrical portion that includes a partially annular outer region and a central bore region, the central bore region suitably arranged to provide support for electrical conductors between the base and lid portions. In particular, this method is effective for determining the number of layers of graphene. In one embodiment, the print heads are arranged so that the inter-head spacing is an integer multiple of the circumference of the encoder roll. The resistance of the conductive material may be inversely proportional to a conductive material length normal to the interface plane.