Electrolytic solution-based AM, or electrochemical AM, is a technique that makes a part atom by atom, promising to make precision parts. The quality of the parts is found to be similar to that made traditionally. When metal ions move and get deposited on a cathode, they form a layer on it. If the cathode is a big plate and the anode is a small rod facing a small area of the cathode, the formation of the layer will be limited to that area. The exact size of the layer will depend upon variables: gap between two electrodes, throwing power of the electrode, applied voltage, form of the voltage, insulation on the side surface of the anode, concentration of electrolytes, etc. But changing the size of the anode provides a way to localize the formation of layers or deposition of materials at some selected area.