Ok thanks, i thinking to drop the ideia of making a UM2 and start to making a UM1 instead, i´m study what materials i could use for the frames instead the plywood, i have a CNC so i can cut this parts, i´m thinking in aluminum but maybe is too heavy and expensive to do that, i don´t really like the acrylic... I have found most of the mechanical and electrical parts in aliexpress, but i´m a little afraid about Chinese material...