Dimensional Accuracy and Shrinkage of Acrylonitrile Butadiene Styrene in 3D Printing Process
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Abstract
Nowadays, 3D printing is widely used in rapid prototyping. The dimensional accuracy of printed parts is very important for producing large-size assemblies or parts that need to precisely fit together. Thus, the effect of infill level on the dimensional accuracy and the shrinkage of the printed parts from Acrylonitrile Butadiene Styrene (ABS) was investigated in this research. Three dimensional measurement was carried out using the optical 3D measuring machine and GOM inspect software. The ABS filaments having a diameter of 1.75 mm were used as raw material for 3D printing. The nozzle diameter is 0.4 mm. The cylindrical specimens of 25 mm diameter and 25 mm height were created with cubic infill pattern at the printing temperature of 230 ºC and the printing speed of 30 mm/sec. There were 5 levels of infill including 20%, 40%, 60%, 80% and 100%. As the results, it was found that all specimens were successfully printed with the desired shape. Their values of circularity and cylindricity were similar. The diameter of printed specimens was smaller than the set value for all parameters. At low percentage of infill, high shrinkage and low density was observed which could result in large dimensional accuracy tolerance. With increasing the percentage of infill, lower shrinkage and higher density were obtained, leading to higher dimensional accuracy.
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