This project developed a 3D microelectrode array integrated on a thin-film flexible cable for neural recording in small animals. The fabrication process combines traditional silicon thin-film processing techniques and direct laser writing of 3D structures at micron resolution via two-photon lithography. Devices include 90 µm pitch arrays, biomimetic mosquito needles that penetrate through the dura of birds, porous electrodes with enhanced surface area, and electrodes integrated in nerve cuffs for peripheral nerve recording. Applications include small animal models, nerve interfaces, retinal implants, and other devices requiring compact, high-density 3D electrodes… Ongoing work is focused on reducing the electrode thickness, increasing density, enhancing sharpness, and increasing channel count.