We released a specification of a new voxel-based data format "FAV" (fabricatable voxel) in July, 2016. 3D model data of FAV format is comprised of a voxel which is a three dimensional picture cell. This representation differs from a mesh-based data format like an AMF, 3MF which are recently proposed or STL which has been used as the 'de facto' standard so far. In addition, we are proposing to more effectively utilize abilities of current 3D printers using a fabricatable voxel which is retaining optimized information to be used for fabrication. Utilizing a FAV format, we can realize modeling a 3D model data not only surface but also internal structure and various attributes such as materials to use, full-color information, connection intensity for each voxel, and so on. Furthermore, it can utilize several processes such as design (CAD) and simulation (CAE) mutually and seamlessly without data conversion from FAV format. In this paper, we introduce a framework of FAV format and structures that FAV can represent. You can design as you like, in detail, regardless of the inside or outside, intensively and minutely using a FAV format. Moreover, FAV format can concurrently maintain three dimensional complicated information of shape and attributes. Accordingly, it is available to be applied to various image processing like a three dimensional half-toning, and to enhance expressiveness of 3D printers.