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International Journal of Bioprinting Biomechanical properties of 3D printable materialv

Figure 2. Printed RGD450+TangoPlus samples (40 mm × 40 mm) of 40 SH and 50 SH (from left to right: 2.5 mm, 3 mm, 3.5 mm, and 4 mm in thickness).

Figure 3. Biaxial tensile test machine and sample placement. (A) Biaxial tensile test machine (LM1 Planar Biaxial, TA Instruments, USA). (B) Sample
placement during the test. Abbreviation: LED, light-emitting diode.

were 0.48 ± 0.09 MPa and 0.91 ± 0.23 MPa, respectively As the thickness of the NinjaFlex material increases, its
(Table 2). failure stress showed a general increasing trend; however,
its stiffness did not show a steadily increasing trend.
3.1.2. Thermoplastic polyurethane The maximum Young’s modulus ranged from 8.24 to
The thickness, failure stress, and maximum Young’s 11.90 MPa.
modulus of the tested NinjaFlex material are shown in
Table 3. There was a noticeable discrepancy between the Upon testing the Filastic material with different
TM
thickness measured in the experiments and the thickness thicknesses, the thickness error between the expected
set at printing. The maximum difference was observed in printing from the manufacturer and the experimental
the NinjaFlex specimen with a nominal 1.7 mm thickness measurement was 0.15 ± 0.02 mm. Table 4 shows the
(10.12%). On the other hand, the NinjaFlex specimen with biomechanical properties of the Filastic material with
TM
a 0.9 mm thickness had the smallest difference (1.67%). difference thicknesses.

Volume 9 Issue 4 (2023) 305 https://doi.org/10.18063/ijb.736