**2. Experiments**

Tensile tests, graded tensile tests, and indentation tests were performed. The experiments were performed on a Testometric M500-50CT (LABOR machine, s.r.o., Otice, Czech Republic) testing machine at four different temperatures (23 ◦C, 44 ◦C, 60 ◦C, and 80 ◦C). The testing machine used was equipped with a furnace (see Figure 1a). The machine was equipped with a strain gauge force sensor with a measuring range of 50 kN and a measuring accuracy of ±10 N. The maximum tensile force of the machine was 50 kN. The samples were clamped with pneumatic clamping jaws. The magnitude of the clamping force was set by the pressure in the system.

**Figure 1.** (**a**) The Testometric M500-50CT tensile testing machine equipped with a temperature chamber. (**b**) The position of specimens during 3D printing and the method used to layer the material.

The specimen shown in Figure 2 was used for the tensile tests, graded tensile tests, and indentation tests. Figure 1b schematically shows the position of all specimens in the printing chamber during 3D printing on a Fortus 450mc printer and the method used to lay individual layers of ABS-M30 material.

**Figure 2.** Specimen shape for simple and graded tensile tests.

After printing, the samples were stored in a dry and dark place for one month and then the necessary experiments were performed.

#### *2.1. Tensile Tests*

All tensile tests were deformation-controlled. Simple tensile tests were performed at four different temperatures (23 ◦C, 44 ◦C, 60 ◦C, and 80 ◦C) and at three different rates of deformation (0.017 mm s−1, 0.167 mm s−1, and 1.667 mm s−1) until specimen failure. Figure 3a shows the force against the displacement at 44 ◦C, 60 ◦C, and 80 ◦C, at a constant deformation rate of 0.017 mm s−<sup>1</sup> (the constant test parameters are shown in the upper right corner of the diagram). It can be seen from the figure that the maximum force value decreased with increasing temperature, however at the beginning of the test the courses of the force were quite similar. One experiment was performed at room temperature, but with the highest deformation rate of 1.667 mm s−<sup>1</sup> (see Figure 3b). Figure 3c,d shows the force

dependence at 44 ◦C and 60 ◦C and at the specified deformation rates. The magnitude of the rate of the deformation had no significant influence on the force course at the beginning of the tests, but led to higher maximum force values at the end of the tensile tests.

**Figure 3.** (**a**) Tensile tests at temperatures of 44 ◦C, 60 ◦C, and 80 ◦C, with constant rates of deformation at 0.017 mm s<sup>−</sup>1. (**b**) Tensile tests at 23 ◦C and at a constant rate of deformation of 1.667 mm s<sup>−</sup>1. (**c**) Tensile tests at a temperature of 44 ◦C, with two different rates of deformation. (**d**) Tensile tests at 60 ◦C, with three different rates of deformation. (**e**) Graduated tensile tests under three different temperatures of 44 ◦C, 60 ◦C, and 80 ◦C. (**f**) Indentation tests with time delay at temperatures of 23 ◦C, 44 ◦C, 60 ◦C, and 80 ◦C, with a constant indenter rate of 0.017 mm s<sup>−</sup>1.
