This is Knee Joint Prosthesis that can be easily 3D printed. It consists of 4 parts namely 1) The lower body, 2) the rotating body, 3) joint pin A and 4) joint pin B. All the parts are designed by focusing the 3D printing technology and to get the best use of it and replace the conventional designs for such prosthesis. As thousands of people get immobile each year due to diseases or accidents. Knee joint is a very important and complex part that often needs to be replaced by an artificial one. But knee prosthesis are outrageous expansive. Since this design of Knee Joint Prosthesis can be 3D printed therefore its cost is too much low than the regular Knee Joint Prosthesis. All parts are interconnected with one another and they not need to be separated and the design is most suitable for 3D printing.