In times where the global housing crisis needs innovative construction methods, 3D printing in concrete arises as a suitable option. Identified as an efficient solution that minimizes construction waste, reduces labor and material costs, and prevents construction errors and cost overruns. This research explores the potential of concrete, an accessible and costeffective material, in 3D printed housing projects. The research emphasizes the importance of modular design for efficient construction and user customization by involving the Kit-of-Parts methodology, creating modular components for easy assembly, enhances design efficiency, cost savings, and flexibility. The thesis explores the integration of complex geometries and non-traditional forms to maximize structural integrity and aesthetic appeal. Experimentation with different material properties and construction techniques is conducted to optimize the 3D printing process for housing applications. A key aspect of the research is the integration of user customization in social housing design, aiming to improve living quality by allowing users to influence the architectural layout according to their needs. The study includes designing housing units with interchangeable components and exploring different building iterations and their structural viability. The thesis concludes by demonstrating the practical application of the proposed concepts through physical prototypes, highlighting the potential of 3D printing in revolutionizing the construction industry, particularly in addressing the affordable housing crisis.