Analysis of the Effect of Post-Printing Treatment of 3D Printer DLP Machine for Polylactic Acid on Surface Hardness

I.A. Rosid, P.N.N. Pratama, G.S. Dewi, M.G.D. Jatiningsih, S.D. Auvia, C. Finansia, N.P. Al-Bana

Abstract


This study aims to determine the effects of factors and levels, specifically, exposure times of 30 and 60 minutes; low and high spinning speeds; and washing times of 5 and 10 minutes on surface hardness using a 2k full factorial design. Statistical analysis revealed that the Washing Time factor had a statistically significant effect on surface hardness with a P-value of 0.036 (alpha = 0.05). Increasing the washing time from 5 to 10 minutes increased the mean surface hardness from 85.31 to 86.19 Shore D, or approximately 1.04%, indicating a statistically significant but modest practical effect within the tested experimental range. Meanwhile, the factors Exposure Time and Spinning Speed, as well as all interactions between the factors, did not have a statistically significant effect on surface hardness. The relatively low R-squared of 36.63% and predicted R-squared of 0.00% indicate that the model has limited explanatory and predictive capability. Residual analysis showed that the assumptions of normality and independence of the residuals were met. Overall, washing time showed a statistically significant but modest effect on surface hardness. Given the limited explanatory and predictive capability of the model, these findings should be interpreted only within the tested experimental range.

Keywords


DLP; post-printing; PLA; surface hardness; factorial design

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References


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DOI: https://doi.org/10.29303/dtm.v16i2.1326

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