A high strength polymer-based cartridge casing can include a first end having a mouth and a neck extending away from the mouth. The method includes generating a first set of beams having a first size. The rotor further comprises a plurality of magnetic poles of alternating opposite polarity. The electrical connection structure of the present invention comprises at least the electrode formed by the carbon nanotube and the biopolymer, wherein the electrode is in contact with the biopolymer.