*2.2. Experimental Work*

The mixture of two proper materials in the production of many composites has widely been used [28–35]. Mixed material has been detected to be effective in the 3D printing by a known approach, such as FDM. PLA is made from natural content with renewable features and also has good mechanical properties, which is noticed by many people who are environmental activists and persist in preventing many plastic products.

Simplify3D software was used to adapt the build parameters of samples. Simplify3D consists of an incredibly realistic pre-print simulation that allows checking the correct performance of the 3D printer before starting the printing process. The simulation contains information relating to the exact speeds, sequences, and settings, which are utilized for the printing. The tensile test sample was designed based on international standard ISO 527-2 by Solidworks software and imported in Simplify3D. Table 3 indicates definitions of FDM build parameters and shows fixed parameters that were kept constant for all experiments. The geometrical dimensions and internal pattern of the sample are represented in Figure 2. The machine used to print the samples was Sizan 3 (made in Sizan Pardazesh Kavir Company, Isfahan, Iran). Br-PLA filament (Kexcelled made in Hatchbox, Pomona, LA, USA) was installed on a specific part of the printer, and the filament was placed between two rollers and nozzle. By setting three input parameters on the printer, two rollers conducted the filament, and heating elements melted the materials. Then, the pressure was created by the rollers to push the half-melted material and deposit the first layer. The platform moved down and allowed the nozzle to print the next layers freely on the plane.

