A printer driver application is executed to form print data to be output at a peripheral device. The rotor wheel also has a plurality of notches formed in the peripheral surface. In order to electrically insulate the subsequent filling of the opening using a conductive contact layer from the material of the epitaxy layer, the walls of the opening are provided with an insulating layer. The first elastic arm is capable of electrically connecting to ground to conduct away static electricity through the second elastic arm, the main body, and the first elastic arm. Each cell is then visited and filled according to the decreasing values of N. The blade can be retracted either manually or mechanically.