Traditionally, the orthopedic field relies on permanent metal implants to manage bone defects and deformities caused by trauma, genetic disorders, cancer, and other conditions. However, these implants often require a secondary surgery for removal due to complications such as infection, implant–bone mismatch, or complete bone recovery. Such additional procedures increase both the financial burden and the health risks for patients and the healthcare system. Biodegradable implants offer a strong alternative, as they can degrade in a controlled manner that supports simultaneous bone regeneration. In this context, additive manufacturing (AM) has emerged as a rapidly advancing and sustainable technique capable of producing complex porous scaffold designs with shorter fabrication times. In this study, AM was employed to fabricate iron–manganese–eggshell metal matrix composite porous scaffolds. These scaffolds were evaluated in vitro using immersion tests, mechanical assessments, and electrochemical impedance spectroscopy. The resulting degradable implants demonstrated favorable mechanical stability and corrosion behavior, maintaining properties comparable to cancellous bone over a 21-day immersion period. Additionally, signs of apatite formation were observed on and within the scaffold structure, indicating strong potential for bone regeneration. Overall, the work highlights how sustainable fabrication approaches—specifically the use of AM and repurposed eggshell waste—can contribute to the development of next-generation biodegradable orthopedic implants.
