| Summary: | 碩士 === 國立臺北科技大學 === 製造科技研究所 === 106 === The geometrical quality and mechanical properties of the FDM-printed 3D model are influenced by several manufacturing parameters. A cooling fan which moved along with the printer head was designed and installed on a commercial 3D FDM printer to control the cooling of printed model. The quality of printed model including the geometrical dimensions and mechanical properties was investigated under different speeds of cooling air flow. It was found that the cooling air speed had different influences on the geometrical quality and mechanical property of the printed model. More specifically, higher cooling speed generated more genuine model in geometry but with lower mechanical properties. With the highest and lowest cooling air speeds of 5 m/s and 1 m/s, respectively, the tensile strengths of the printed models differed in 4 folds. Because the cooling air speed controlled the temperature of PLA after squeezed out from the printer head, the material temperature was also an important factor in the manufacturing process. Moreover, better quality in 3D printed model can be obtained if no support material is used. This was also demonstrated in this study that 3D printing without support material was feasible if proper cooling with air fan had been used. Therefore, the air speed of the cooling fan can be employed as an additional control parameter in 3D printing for a specific model
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