Macroscopic fibers of conducting polymers could be woven into lightweight antistatic fabrics, used as electrodes in batteries, or employed in light-emitting displays. For this to be possible the fibers will need to exhibit high strength and flexibility. Here, an electrochemical process is presented which is based on the use of hydrodynamic forces to control the direction of polymer deposition. The process also has potential for application to other organic conductors and superconducting oxides.