Abstract: To study the design idea of 3D printer nozzle based on FDM technology driven by temperature factor. The scale factor method was used to set up the evaluation index system of 3D printer printing accuracy under multi-objective conditions. Three different nozzle diameters and two different heating chamber structures were designed to form six comparison schemes. The performance of these schemes was analyzed in the joint comparative experiment of 12 printing media. (1) Through technical means to strengthen the temperature control accuracy of the heating element, make it controlled near the melting point of printing medium, which can effectively improve the performance of 3D printer. (2) Under the temperature conduction mechanism of the heating chamber, the system efficiency is the highest when T = 1.03T₀. (3) Reducing the nozzle diameter D₀ can effectively reduce the statistical expression of B_DS. The smaller diameter FDM nozzle can achieve higher printing accuracy from the statistical point of view, and the parameters affecting the printing accuracy also include the control accuracy of heating body temperature.