I am developing a small, next-generation dry EEG electrode for a wearable headset. The complete electrode, including housing, is about 20 mm in diameter and must be suitable for home 3D printing on a Prusa Core One with a 0.25 mm nozzle. You will design both: 1. The mechanical electrode body (pins, structure, housing, mounting). 2.The active electrode PCB (high-impedance buffer, guard/shield, protection, connection to main board). The CAD design must work reliably in TPU and PLA. Wall thicknesses, infill, clearances and joints should be chosen so that the parts behave correctly with the different flex profiles of both filaments. The design must provide: a. stable skin contact through hair (dry EEG pins), b. controlled surface texture for signal stability, c. exact dimensions that remain accurate after cooling, d. structural strength at all interfaces to the electronics and headset. The electrode housing must include: a. clip-on or snap-fit mechanisms that lock securely without overstressing TPU/PLA, b. ergonomic grip features for quick manual handling, c. a defined cavity for a small round PCB for the active front-end (no post-processing needed to fit the board), d. provisions for guard/shield structures where appropriate. I need someone who is willing to: a. reflect on the initial concept, b. read relevant scientific / technical literature on dry EEG and active electrodes, c. analyse strengths and weaknesses and d. propose improvements to the pin geometry, electrode structure, shielding and PCB topology if you see a better solution. I will provide you with rough sketches, previous concepts and PCB outlines after we start. From you I expect: A fully parametric CAD model (STEP or Fusion 360 preferred). Print-ready STL files optimised for a 0.25 mm nozzle, including recommended layer heights, build orientation and notes on supports and tolerances for TPU and PLA. Willingness to go through several revision cycles, based on real-world test prints that I will run on the Prusa. More detailed specifications, performance targets and reference material will be shared privately once we begin working together.