This thesis describes the process of designing a 0.84 m diameter and 125 W horizontal axis micro wind turbine. The study is focused not only on rotor aerodynamics but also on the selection of main components for power generation and control. For the purpose of this investigation, pitch and yaw control are not considered. In the first part, blade design and performance analysis are presented. Rotor size is selected as a trade-off between different constraints, including 3D printer limited capacity, low costs and relatively high power output. The small dimension of the blade enforces the adoption of a low Reynolds airfoil, selected among several profiles for its ability to guarantee higher lift to drag ratio.