Construction industry has been developing rapidly in past years. Adaptation of new technology in this digital era is highly needed to be able to compete within the industry development. Precast concrete implementation used to be one solution for speeding up project performance. But the production of the precast concrete itself also needs to boost to match the speed of construction development. The purpose of this research is to intervene mass production of precast concrete by using 3D printing technology to increase the productivity rate. Model simulation combining the use of 3D printing from COBOD Company and observation on Project X precast production in PT Z factory was conducted using Primavera software based on structured interviews done with related parties from COBOD Company, PT Z, and Project X. Discussion with three experts is also conducted to validate the simulation result. This study results on the productivity improvement by 50% compared to original conventional method. Faster productivity with less environmental impact, the use of 3D printing is able to benefit this industry. With the same area of production yard and the same number of human resources, factory can speed up two times faster only by replacing the casting method to 3D printers.