## 5 Conclusions  
The goal of this study was to determine how three different varieties of glass particles impacted the performance of the PLA polymer in MEX 3D printing. Glass particles in various shapes and concentrations were used to create PLA-based compounds, with a maximum weight concentration of 9.0% in the polymer matrix. A variety of mechanical tests were used to thoroughly characterize the PLA polymer with glass additions. The evaluation of qualities including impact strength, micro-hardness, tensile strength, and flexural properties, was performed in accordance with international standards. The filaments created by thermomechanical extrusion were also put through tensile testing. This extensive experimental procedure enabled a complete evaluation of the mechanical properties of the PLA composites with glass fillers and offered insightful information about how effectively they performed in 3D printing applications. The findings of the investigation confirmed the hypothesis, showing that adding glass particles enhanced the mechanical properties of the polymeric matrix. Significant improvements have been observed in most of the mechanical properties of all types of glass particles employed in this study. Among the mechanical parameters examined, flexural strength showed the greatest improvement. In particular, a notable increase of 46.8% was achieved when evaluating the PLA/Glass Beads 3.0 wt.% sample in comparison to pure PLA. Additionally, the PLA/Glass Beads 3.0 wt.% sample's flexural toughness significantly increased above pure PLA by 31.2%. The results highlight the significance of glass beads as an efficient reinforcement agent, enhancing the durability and performance of the PLA composite in situations where bending load resistance is essential. Additionally, after evaluating the PLA/Glass Flakes 6.0 wt.% sample, the tensile strength showed a substantial improvement of 25.6%. The material's increased resistance to tensile pressures and deformation is indicated by this improvement. The thermogravimetric measurements revealed that the inclusion of glass particles had no discernible impact on the thermostability of the thermoplastic polymer. The absence of a substantial change in thermal stability suggests that the addition of glass particles had no adverse effects on the composite materials' overall thermal performance. This demonstrates that the selected methodology and processing settings are appropriate for the materials under investigation. The investigations of the Raman spectroscopy used in this study provided important insights into the chemical interactions that occurred between the glass particles and the polymeric matrix. According to the findings, neither PLA nor glass particles had any chemical reactions, nor were any alterations to the polymeric matrix's chemical linkages noted. This result implies that there were no major chemical alterations or reactions brought about by the addition of glass particles to the composite material. These findings open up new directions for research and development in the fields of advanced materials and 3D printing technology by highlighting the potential of glass particles as efficient reinforcement agents for improving the performance of PLA composites in a variety of applications. Such composites expand the fields of application of MEX 3D printing, particularly in areas requiring higher mechanical standards from the 3D printing parts, exploiting the advantages of the process, such as the freedom to produce complex geometry parts in a short span. At the same time, both the matrix and the additives are sustainable and biocompatible materials that can be used in respective types of applications. In future work, additional types of glass particles can be evaluated for their performance as reinforcement agents, and loadings in the composites can be further optimized and the process for their preparation can be upscaled for industrial use. Conceptualization, N.V. and M.P. ; methodology, N.V.; software, N.M. and P.B. ; validation, V.R. and V.P.