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Wang, et al.
additive manufactured PEEK has different anisotropy FDM technology. Experimental results show that under
with different layer thickness and printing angle, and the layer thickness of 0.2 mm, the printing speed of
the PEEK specimens with the layer thickness of 0.3 mm 60 mm/s, and the filling speed rate of 40%, the PEEK
and the printing angle of 0°/90° alternately have the sample has good comprehensive mechanical properties,
best mechanical properties, with the maximum bending with the tensile strength of 40 MPa, tensile fracture
strength of 56.1 MPa and the maximum tensile strength elongation of 14.3%, bending strength of 68.2 MPa, and
of 56.6 MPa (Figure 6A and B) [70] . The printing speed impact strength of 101.2 kJ/m (Figure 6C-E) [71] .
2
and filling rate can also affect the properties and the Therefore, because FDM 3D printing method
microstructure of PEEK material manufactured by the adopts the method of line-line bonding and layer-layer

A B

C D E

Figure 6. Process parameters of FDM and the mechanical properties of PEEK materials. (A) Tensile property of PEEK; (B) SEM images
of fracture cross-sections of PEEK; (C) fractured tensile specimens; (D) comparison of tensile properties for different printing parameters;
and (E) impact strength and absorbed energy [70,71] .

A

B C

Figure 7. The manufacturing process of personalized sternal rib implants. (A) Performance requirement analysis of sternal prosthesis. (B)
Printing path planning and a close-up of the support structures. (C) 3D-printed PEEK sternal rib implants.

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