Herein, we report the mechanical and piezoresistive sensing performance of 3D printed auxetic nanocomposite structures composed a high-density polyethylene (HDPE) matrix multi-walled carbon nanotubes (MWCNTs). The multifunctional MWCNT/HDPE were measured under tensile loading. results indicate that by varying MWCNT content, as well relative density cell topology (S-shaped, Chiral Re-entrant) st...