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3D printing is a revolutionary manufacturing technique with several advantages over traditional manufacturing processes. This technology has vast applications from aerospace to the food industry, construction of solid architectural buildings, brittle glass, and rugged titanium products. It also reduces specific energy demand during processes and lowers carbon footprints. During 3D printing, various metals like titanium, zinc, cobalt, and iron, result in hazardous waste emissions during their metal printing process. These emissions include volatile organic compounds (VOCs), nanoparticles of metals, particulate matter, fumes, and oxides of metals. Exposure to these waste products leads to serious health problems related to the respiratory system, dermal and ocular issues. Emissions penetrate the skin and reach the tissue level, leading to pulmonary inflammation, allergies, and other related health issues for nearby workers. So, proper safety precautions must be taken while using 3D printing technology. This review addresses the environmental aspects of 3D printing metals and alloys as metal 3D printing has become very popular in schools, colleges, and research institutions.