Research And Optimization Of FDM 3D Printing Structure

3D printing using Fused Deposition Modeling technology is a new type of manufacturing technology. It has been widely used due to its fast speed of manufacturing and flexibility. The printing structure is the structure printed by 3D printer during manufacturing process, including shell, infill, support and raft. However, there are some defects in current printing structure, such as the low intensity of detail area in the model and the filament waste cost by line support and grid support. In view of the problems mentioned above, the infill structure and support structure are investigated and some optimization methods are proposed.To overcome the defects of infill structure, detail area infill method and detail area partition algorithm are proposed. Through analyzing the geometric feature and area classification, two-dimension area partition algorithm and three-dimension detail area expansion algorithm are proposed respectively. Two-dimension area partition algorithm is proposed to construct detail area of slice layer and it is realized by the method of small layer part judgment, narrow layer part judgment, detail area construction of layer part with sudden change and detail area construction of layer part with hole. Three-dimension detail area expansion algorithm is proposed to extend detail structure to normal structure.To overcome the defects of traditional support, a binary-tree like support is presented. Firstly, the algorithm of supporting point picking are proposed which is used to pick the lowest point of neighbor in division parts of supporting area. Secondly, algorithm for generating the support is proposed to generate the key points of tree structure. At last, the tree support construction method is presented.Finally, experiments are carried out and all the algorithms are tested. The results suggest that the intensity of detail area in printing model is improved by detail infill method and the binary-tree like support can reduce filament waste and it is easier to remove. Furthermore, both printing structure can improve the efficiency of the printing process.