This paper explores the design of standardized 3D-printed joints for small-scale architectural models, using the traditional mortise and tenon joint as a prototype. In comparison to traditional subtractive manufacturing for model production, 3D printing proves beneficial in saving time and materials. Therefore, many architectural students and design firms frequently use 3D printing for making models. Considering the limited size of 3D printers, convenience of transportation, and flexibility in demonstration, it is more advantageous to print model components with assembly joints rather than printing the entire model directly. This paper focuses on small-scale architectural models ranging from 1:50 to 1:200, conducting a typification, standardization and parameterization study of 3D-printed assembly joints. 13 standard joints are designed, forming a database and an interactive application.