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...Open University's Chemistry courses. Sustainable use of resources must be considered because fossil fuels and other mined commodities are being depleted, and there is increasing demand from humanity. Achieving sustainability involves many challenges, from preserving resources to tackling pollution arising from plastics, persistent organic pollutants and gaseous emissions....

...source, normally a laser, sufficient to melt a thin layer of powder applied to the surface of a substrate. Material is added layer by layer by lowering the build by a small amount and spreading a thin layer of powder over the surface. To create the desired geometry, the heat source is traversed over the powder bed, locally melting small regions to form successive layers....