AbstractThis paper presents a study of replacing, in the domain of wax injection molding process, the traditional metallic mold with a mold made of a RP plastic material combined with a PCM material. The process being studied here uses melted paraffin wax as the injection material. Numerical simulation of transient heat transfer was conducted with COMSOL multi-physics software. The behavior of the melting and heat absorption of PCM was simulated by modifying the specific heat of the material to account for the increased amount of energy in the form of latent heat of fusion over its melting temperature range. ABS plastic mold was made through FDM Rapid Prototyping process and a carefully prepared experiment was successfully conducted. To confirm the validity of the numerical simulation, the data acquired during the experiment was compared with the numerical results and the outcome was satisfactory.