pine-a64 case multicomponent

Summarycase for https://www.pine64.org/devices/single-board-computers/pine-a64/This SBC is really cheap in second-hand market. (10$ probably)all parts below can be 3D printed.use for the case：m3 18mm pillar x4m3 5mm pillar x8m3 5mm nut x4for the fan on top：m4 20mm(length is determined by your fan) bolt x4m4 5mm nut x4