http://bunkai.sakura.ne.jp/bunkai-wp/3d_printer/575/ ??????????????????????? ??1mm/?1.2mm??????1???????? ?????????????????????????????????????? ?????????????????????????????????????? ??????????????????????????????? I made ??the fan guard with the aim of the world's lightest. Weight is 1 gram or less below 1.2mm width 1mm / thickness. It looks poor, serve well as a fan guard there is strength. Further, in order to avoid contact with the fan blades, bolt hole portion is based on a slightly thicker. By that you create as much as possible thin, thin, and reduce to the maximum intake resistance.