Nano cellulose (NC), which is produced from trees, is notable for considerable mechanical potentials (lighter than iron and comparable to steel from a strength: approximately 300 MPa, high specific surface, gas barrier, and transparency, low coefficient of thermal expansion, characteristic viscosity, etc.). In order to bring out remarkable properties of NC, its nanostructure must be controlled. As for making filament, the control is accomplished using flow focusing device which align NC by flow shear force (Håkansson et al., Nature Communications, 2014). The channel had three inlets to inject NC dispersion and gelling agent, and one outlet which was submerged in a coagulation bath. Concerning a preliminary study of our research group, it was revealed fine NC filament had far higher thermal conductivity than woods have. We aimed to develop continuously manufacturing system for fine NC filament with high thermal conductivity. The system consisted of a flow focusing device, a coagulation bath and a winding apparatus. We reports that all apparatus had finished to be designed and most of devices were fabricated. And furthermore, fine filaments were produced successfully.