Capacity planning is the process of determining the equipment capacity required by a manufacturer to meet future demand for its products . 3D printing capacity planning is to select 3D printers and determine the number of each printer to be acquired. However, 3D printing capacity planning is subject to the following challenges. First, although a 3D printer is most suitable for fabricating specific types of 3D objects (or parts), it theoretically can print almost all types of 3D objects, making the selection of an optimal 3D printer a difficult task [2, 3]. In addition, 3D printers are usually applied for the rapid prototyping of new products. However, it is difficult to estimate the demand for such products that are still under development.