The water oxidation is the limiting step in the water-splitting process[1]^,[2]. Given this scenario, the development of new catalysts is essential in this field. The emergent demanding is the use of Earth-abundant elements and catalysts with high performance under mild condition. Because of this, catalysts such as Prussian Blue analogues have been receiving a lot of attention in recent years[3]. In addition, working under neutral conditions allow us to take advantage of the modification of conductive polymeric 3D printed electrodes with Prussian blue. Thus, we described in this work, the development of the polymeric 3D printed electrodes modified by Cobalt-Prussian blue and their performance in the water oxidation reaction (WOR).