Here, we present a novel fully printed electrochemical sensing tool for determining phosphorus levels in sediment samples. The integrated electrochemical device is composed of an office paper-based sensor combined with a customized 3D printing cube-shaped holder used for the extraction of phosphorus from sediment samples. The extracted phosphorus was trapped on a filter pad placed over the sensor and preloaded with acidic ammonium molybdate, allowing for the formation of the phosphomolybdate complex, which is electroactive. The use of carbon black as a nanomodifier of office paper-based electrode together with square wave voltammetry enabled the detection of phosphorus with a detection limit of 0.011 ppm within a broad linear range of 0.039-20 ppm. Furthermore, this sensor demonstrated excellent selectivity towards phosphate ions among the several ions studied, namely NO