Fused Deposition Modeling (FDM) is a three-dimensional (3D) printing technique in which parts are produced with thermoplastic polymer layers in a highly controlled manner. However, the production of ready-made parts using FDM is quite tricky. At the same time, the mechanical properties of parts printed with current print parameters and low-cost 3D printers also vary. The quality and mechanical characteristics of the final part are influenced by production parameters such as the extrusion temperature, infill density, infill pattern, print speed, and layer height. This study focused on the effects of the infill pattern, infill density and print speed parameters on the tensile strength and production time of model structures printed with PLA+ material. The tensile strength of the printed parts have been determined by a WDM-100E model tensile testing machine. In addition, the tensile strengths and production times of the parts have been optimized by the signal-to-noise (SN) ratio analysis. The results reveal that triangle infill pattern exhibits the best tensile strength at 40 mm/sec printing speed and 100% infill density. On the other hand, the lowest production time is observed in the gyroid infill pattern.

This study investigated the effects of electro-erosion (EDM) processing parameters on TiN-coated Ti6Al4V alloy by the physical vapour deposition (PVD) technique. Electrode wear rate (TWR), workpiece machining rate (MRR), and surface roughness (Ra) values were determined by including discharge current, pulse time (t_on), and two different tool electrodes (E-Cu and CuBe) into the EDM process parameters. Variables affecting the experimental study (ANOVA) were performed depending on the analysis of variance method. For the analysed (ANOVA) TiN-coated Ti6Al4V samples, the most optimal parameters of MRR value were determined using current 12 A, t_on 100, and Cu electrodes. For the TWR value, the optimum parameters were examined by using current 6 A, t_on 100, and CuBe electrodes. Finally, 12 A current, t_on 100, and electrode E-Cu were analysed for the lowest Ra value. The results showed a better result in MRR and Ra with increasing discharge current, while a better result was obtained in TWR with increasing pulse duration and decreasing discharge current. In addition, it was observed that the E-Cu electrode performed better than the CuBe electrode in processing TiN-coated Ti6Al4V.