This paper presents a study of the thermal conductivity of Poly Vinyl Alcohol (PVAl) for medical devices production by use of rapid prototyping technique (RP). The RP technology was originally used for making industrial prototypes, but with technological advances, this technique has been used and studied in medical field eg for customized devices production  for each patient and biomodels applied in surgical plans. RP manufacturing technique not only allows the production of products with high precision but also a very fast production, which decrease development product cycle. However, to ensure the accuracy of the built part is important to know and study the thermal behavior of the material, once the property of thermal conductivity significantly alters the processing parameters used in the machine. Thus the aim of this study is evaluate how the heat diffuses into PVAl when applied into a Yterbium Laser source so as to guarantee the uniformity in  material curing and thus avoiding possible dimensional errors in the  built part. Results were obtained from numerical simulation with ANSYS CFX ® software. The simulation allowed the determination of temperature profiles in the material when interact with the Laser source. The Laser power applied to the material, as well as the interaction time were varied and optimal values for processing and crosslinking  PVAl were obtained