3.1 Machine Input Parameters
The input parameters are taken from three levels as shown in Table.3. The strength of FDM-fabricated parts is significantly influenced by the input parameters. In this study, three process parameters were investigated at three levels: i) raster angle, ii) layer thickness, and iii) the number of outer shells. The following are the input parameters that were chosen.
<<< Table.3 Machine Control Parameters >>>
To identify the various material combinations, designations were given as shown in the table. 4. The sandwiching materials were first taken by volume, with the PLA/PLA-Composites proportions of 80/20, 70/30, 60/40, and 50/50. Sandwich proportions were confirmed by trial and error; the PLA was less than 50% in the compositions, and the proportion of 50:50 boosted the strength.
<<<Table.4 Material Designation>>>
The Table.5 table displays the input parameter combinations for the three-level raster angle, layer thickness, and the number of shells used to print specimens.
<<< Table.5 Machine Control Parameters >>>