| Currently, fused deposition modeling (FDM) is one of the most popular 3D-printing technologies. It is characterized by the machinery simplicity, low cost, multi-materials and large modeling size although some limitations remain. For example, the printing speed is low, the surface quality of the model is not so good and only one color can be used in printing at a time. In recent years, much attention has been paid to the study of FDM equipments and materials worldwide, and numerous achievements have been obtained. However, corlorful FDM 3D printers are still rare, and are mainly concentrated in Europe, U.S.A. and other developed countries/districts. Colorful 3D models have a much stronger realistic and stereo visual effect, which can better meet human and social needs. To this end, this research project focuses on the research of colorful FDM 3D printing cooperated with Nanjing 1001 automation technology Co., Ltd.Firstly, this paper analyzes and summarizes the progress achieved by domestic and foreign researchers on the field of colorful FDM 3D printing. According to F500 3D printer and the process of artificial replacement of filaments, a novel approach of multi-color FDM 3D printing is presented based on automatic replacement of filaments;Secondly, according to the proposed approach, the whole system of colorful filament connector is designed, including mechanical structure, control system hardware and software. Mechanical structure parts mainly include transporting-filament mechanism, cutting-filament mechanism and switching-filament mechanism. Control system mainly includes serial port communication, stepping motor control and status monitoring sub-system;Then, this paper designs the whole system of colorful filament connector, including mechanical structure and the hardware/software of control system. A real-time computing algorithm of S-curve is proposed, which can effectively avoid undesirable phenomena of step losing, overshot and oscillation for step motor control;Finally, this study makes a physical prototype of colorful filament connector, and debugs and tests the colorful filament connector. To satisfy the positioning accuracy of switching-filament mechanism, debuggings for control parameters of acceleration and deceleration are conducted. An experiment platform is established to test the core function of switching filament. The results show the device can meet the design requirements. |
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