This is an artificial fracture network model for 3D printing. The detail of design and preparation can be found in Suzuki et al., WRR, (2017). The inner and outer diameters of the cylindrical model are 2.54 cm and 3.81 cm, respectively. The height of the model is 4 cm. The maximum radius was set to a quarter of the sample length in order to prevent the fracture from penetrating through the sample. Since the aperture ratio is set to 0.125, the minimum radius is 1.6 mm.
