This data set is a compilation of the information needed to re-create the findings in the study "Optimisation and Experimental Validation of Near-Isotropic 3D Ordered Star Cell Auxetic Structures". The file contains images and Ncorr files for the image analysis of the physical tests and Ansys and data files to run the FEA models for as tested cells, isotropy analysis and the optimisation and setup of the individual cells. The four parts of the data set are: 1) the images and n_corr session data used to assess the Poisson's ratio of the samples with image analysis; 2) the Finite Element models used during the optimisation of the base cells in various stages, with infinite simulation boundary conditions and the output values; 3) the flat angle form of the Finite Element models to allow re-creation of the isotropy tests for each lattice; 4) the as-tested FEA models to allow re-creation of the validation simulations for the physical testing process.