Microstructural characterization and high-temperature mechanical behavior of 3D printed eutectic HEA (AlCoCrFeNi2.1) has been explored for the first time. The material was manufactured through laser engineered net shaping (LENS). The microstructural study revealed dual phase dendritic and eutectic structures consisting of ordered FCC (L12) and BCC. The phase fraction of L12 is more across build (X face) and BCC is more along build (Z face). Anisotropy in hardness was observed along Z and X which further resulted in yield anisotropy during compression test at room temperature. High-temperature compression study has been explored at various temperatures of 400°C, 600°C, 700°C, and 800°C. Yield strength tends to increase from room temperature till 400°C and starts dropping till 800°C. First principle calculation was done by using diffused multi-layered fault (DMLF) model by high throughput computation for estimating the planar fault energies.