Statistical and experimental study on additive manufacturing of Polyethylene Terephthalate Glycol using fused deposition modeling

The effects of the main Fused Deposition Modeling (FDM) process parameters including the layer thickness (0.1–0.3 mm), raster angle (0°, ±15°, ±30°, ±45°, and 90°), and infill percentage (40–100%) on the part weight (PW), built time (BT), maximum failure load (MFL), and elongation at break (E) of polyethylene terephthalate glycol (PETG) were investigated through the design of experiments (DOE) approach. The influence of the participation of each FDM process parameter on the output responses was examined through the response surface method (RSM) and analysis of variance (ANOVA). The results confirm that by increasing the raster angle (RA) and infill percentage (IP), the built time (BT) will be increased. Also, the built time decreases when the layer thickness is increased. It was concluded that the infill percentage had the most significant impact on the part weight, while the raster angle had the least impact. Increasing the LT and IP led to increased part weight in the samples. The highest achieved part weight was 5.6084 g, with an infill percentage of 100% and a layer thickness of 0.2 mm. ANOVA result confirmed that increasing the IP and LT increases the MFL value. Finally, the minimum value of the part weight and built time and the maximum value of the maximum failure load and elongation at break are considered optimization criteria.