banana pi DXF file docment downlad link:
https://drive.google.com/folderview?id=0B4PAo2nW2Kfnfkd0QmxaU3F2bHBWdkFiS09vT3VoZkVyNW93OXFjM0dHRVdGazhRWmFzZDQ&usp=sharing&tid=0B4PAo2nW2Kfndjh6SW9MS2xKSWs