<p>Due to their negative Poisson’s ratio, auxetic materials have gained significant prominence in many engineering applications in recent years. Auxetic materials are mostly obtained using modern manufacturing techniques such as additive manufacturing and laser cutting. While these methods enable the production of sharp corners, they also present disadvantages such as stress concentrations and manufacturing difficulties, particularly in sharp cornered designs. However, limited studies have been found in the literature examining the effects of adding edge fillet to sharp cornered auxetic structures afterward. Therefore in this study, based on the geometries of sharp cornered auxetic structures found in the literature, edge fillets were applied to these designs and remodeled. The mechanical performance and auxetic behavior of the new designs were evaluated both experimentally and finite element method (FEM). Thus, the effects of later added edge fillets on structural strength and negative Poisson’s ratio were systematically investigated. A 17.56% increase in plateau force was observed with increasing edge fillet radius and in the peak force parameter, an average increase of 50.80% was observed (r0.6). In terms of the densification point, an average decrease of 12.66% was noted across all auxetic structures. Additionally, the Poisson’s ratio decreased with increasing edge fillet radius, with an average reduction of 36.18% observed in all auxetic structures (r0.6). In addition, small amounts of edge fillet radius in auxetic designs minimizes stress concentrations, while maintaining nearly the same auxetic properties. This allows for the design of auxetic structures with increased manufacturability and compatibility with various manufacturing technologies.</p> Graphical abstract <p></p>