Surface Roughness Modeling of Material Extrusion PLA Flat Surfaces

Table 1

The independent variables and combinations of three levels utilized to print specific workpiece runs.

Runs	Coded factors			Independent/input parameters			Dependent/measured parameter [μm]
	X1	X2	X3	Th (mm)	Ps (mm/s)	Id (%)	Ra-0	Ra-45	Ra-90
1	1	1	1	0.1	70	30	2.99	8.52	12.04
2	1	2	2	0.1	80	40	2.13	8.81	13.02
3	1	3	3	0.1	90	50	2.92	8.97	14.08
4	2	1	2	0.15	70	40	4.28	9.21	15.01
5	2	2	3	0.15	80	50	3.26	9.25	15.35
6	2	3	1	0.15	90	30	1.52	9.77	16.22
7	3	1	3	0.2	70	50	1.64	9.68	15.31
8	3	2	1	0.2	80	30	1.50	9.53	17.24
9	3	3	2	0.2	90	40	1.57	9.61	18.14