Abstract: A method for fabricating a micro-organ device includes printing a micro-organ on a microchip using a cell suspension in a syringe controlled by a computer-aided tissue engineering system, wherein the cell suspension comprises cells suspended in a solution containing a material that functions as a scaffold, and wherein the printing is performed with the computer-aided tissue engineering system according to a predetermined pattern. A micro-organ device includes at least one micro-chamber each housing a micro-organ; and at least one microfluidic channel connected to the micro-chamber, wherein the micro-organ comprises cells arranged in a configuration that includes spacing between portions of the cells to facilitate diffusion exchange between the cells and a medium supplied from the at least one microfluidic channel.