In this study, a software has been developed for parametric design and modeling of logarithmic spiral gears and gear pairs, which are a member of non-circular gears, using complex numbers in the CAD (Computer Aided Design) environment. In software development, the widely used AutoLISP programming language, a software programming language specially designed for AutoCAD, was used. In the program, parameters such as modules and number of teeth are entered by the user interactively, and the design and modeling of logarithmic spiral gears in the AutoCAD environment is performed automatically. The production of this designed gear pair has been completed with a 3D printer. This work contributes to the designer for the functional and precise production of logarithmic spiral gears to the design and manufacture of these gears. This work contributes to the designer and manufacturer in the functional and precise design and production of logarithmic spiral gears.