## 3 Results and Discussion
### Functional Features, Limitations, and Directions of Potential Applications for the L-FDM Method  
The examples displayed in Table 9 demonstrated the diverse applications of the innovative L-FDM printing technique. In the pharmaceutical area, L-FDM printing allows producing personalized drugs, allowing the adjustment of doses and compositions tailored to the individual needs of patients. In addition, this technology enables the production of tablets of nonstandard shapes with the possibility of controlled release [23; 24; 25]. Three-dimensional printing presents a potential avenue for incorporating radioactive isotopes into polymer matrices in the realm of isotope technologies. With this method, the precision and customization are enhanced, allowing for the creation of printed targets that optimize the geometry. This ultimately enhances the irradiation efficiency and overall effectiveness. In the field of nuclear medicine, 3D printing is used to create personalized, anthropomorphic phantoms. These phantoms are important for planning radiotherapy, validating dosimetry, and studying medical imaging. Tailored treatment strategies for patients can be achieved through the use of custom phantoms, resulting in improved outcomes. L-FDM technology allows for the direct production of radioactive materials without the need for additional processing steps such as rolling, extrusion, or granulation. By eliminating these steps, the risk of contamination for various machines is greatly re  
Figure 15: EDS images of L-FDM-printed parts with metal ions introduced into the polymer matrix. (**A–C,E,K**) Images of the surface of the cylinder’s side, and (**D,F,G–J**) images of the cross-sections. (**A**) Lead EDS image of ABS with lead acetate, (**B**) lead EDS image of ASA with lead acetate, (**C,D**) lead EDS image of PET-G with lead acetate, (**E**) lead EDS image of PLA WOOD with lead acetate, (**F**) silver EDS image of PLA WOOD with silver nitrate, (**G**) iron EDS image of PLA WOOD with iron (III) chloride, (**H**) iron EDS image of PET-G with iron (III) chloride, (**I**) iron EDS image of PLA with iron (III) chloride, (**J**) rubidium EDS image of PLA with rubidium sulfate, and (**K**) rubidium EDS image of PLA WOOD with rubidium sulfate. duced [26; 27; 28]. One crucial matter to consider is the incorporation of technology in basic chemical research. Utilizing new compounds can expedite the testing process for potential applications without requiring scientists to possess in-depth knowledge regarding plastic processing or complex equipment. The modification of a polymer with chemical compounds can be studied with ease by researchers immediately after laboratory synthesis. Apart from medicine and pharmacy, 3D printing has potential applications in the cosmetic industry. Specifically, this technique can help in printing skin delivery platforms such as patches and microneedles [29]. Printed cosmetic microneedles can be a delivery system for both hydrophilic and lipophilic active ingredients that will be introduced into the material during the L-FDM process [30]. According to scientific research, the use of 3D printing allows for the customization of dressings to fit the specific needs of each patient. By incorporating metals, nanoparticles, drugs, natural compounds, proteins, and peptides into the polymer matrix, there is the potential for these dressings to aid in wound healing, acne treatment, pain relief, and antiaging [31]. In addition, the 3D printing method holds potential in the field of oceanography. With the harmful impact of ocean acidification on coral reef ecosystems, alkaline materials may be incorporated into 3D-printed objects to aid in the production of artificial coral replicas for reef restoration. The integration of nanotechnologies can aid in the creation of 3D-printed replicas of coral reefs that will promote a faster recovery.