I am using these materials for the anode and cathode electrodes. Copper wire and Zinc wire. Both I purchased from Amazon.com and received quickly. The wire can be wrapped around a cylinder to hold it tightly in place. These larger cells are for initial prototyping , and I would like to print a smaller version that is portable power.

https://www.amazon.com/gp/product/B000IJYRDE/ref=oh_aui_detailpage_o01_s00?ie=UTF8&psc=1

https://www.amazon.com/gp/product/B001QUVU0W/ref=oh_aui_detailpage_o01_s00?ie=UTF8&psc=1