1. Produce a rectangular sample made of two layers, as shown in
Fig. 3. Each filament running along the major side is divided
into 20 segments that is printed using a decreasing value of the
extrusion rate. In the sample reported in Fig. 3, the filament
diameter d filament varies between 0.42 mm and 0.6 mm, given a
space between filaments of 3.2 mm. The G-code for the
manufacturing of a functionally graded filament is given in
Table 2. The detailed G-code for the production of the
Fig. 3 Example of a specimen used for the buckling test. The graded filaments
are those running along the major side
Table 2
G-code instructions for the fabrication of a functionally graded filament
sample
G1 X160.00000 Y51.00000 Z0.64000 E4.218961; Segment #1
G1 X160.00000 Y52.00000 Z0.64000 E4.238660; Segment #2
G1 X160.00000 Y53.00000 Z0.64000 E4.258358; Segment #3
G1 X160.00000 Y54.00000 Z0.64000 E4.278056; Segment #4
G1 X160.00000 Y55.00000 Z0.64000 E4.297755; Segment #5
G1 X160.00000 Y56.00000 Z0.64000 E4.317453; Segment #6
G1 X160.00000 Y57.00000 Z0.64000 E4.337152; Segment #7
G1 X160.00000 Y58.00000 Z0.64000 E4.356850; Segment #8
G1 X160.00000 Y59.00000 Z0.64000 E4.376548; Segment #9
G1 X160.00000 Y60.00000 Z0.64000 E4.396247; Segment #10
36
Alessandra Bonfanti et al.