<p>This study explores the structural behavior of 3D-printed concrete (3DPC) walls through numerical simulations, with a focus on the impact of interfaces between printed layers. The numerical analysis is performed in ABAQUS^®, with the concrete damage plasticity (CDP) model used to represent the printed layers, while cohesive zone modelling (CZM) is applied to simulate the interfacial behavior. A notable aspect of this work is the implementation of a modified damage equation that introduces an exponent to control damage evolution during compression, aligning it with the constitutive response derived from analytical expressions in the literature. A series of parametric studies are conducted to assess how different parameters, including the damage exponent, maximum compressive strength, and cohesive parameters, influence structural performance. The numerical results are compared with experimental data to validate the approach, demonstrating the critical role of interface behavior in the overall structural integrity of 3DPC walls. This research contributes to the understanding of 3DPC wall performance, providing a framework for future investigations into the optimization of 3DPC structures. In addition, the impact of different infill designs on the structural performance of 3DPC walls is explored, highlighting the importance of infill geometry in enhancing wall stability.</p>