Overall, the average learning aid would save teachers 86% when fabricating it themselves. The results show current open-source 3-D printers are capable of manufacturing useful learning aids and that doing so provides high economic savings in the classroom. Learning aid designs are analyzed in detail for their economic viability considering printing and assembly costs with purchased components and compared to equivalent or inferior commercial products available on Amazon. To determine if costs could be reduced for learning aids, this study analyzed classroom-based distributed digital manufacturing using 3-D printing of open-source learning aid designs. While schools struggle financially, capital for purchasing physical learning aids is often cut. In an attempt to address both of these issues, the paper reviews some particularities of 3D printing open technologies and proposes a new integrated and user‐oriented 3D printing framework, independent of hardware and adaptable to non‐standard recycled plastic raw material from marine waste. A secondary issue is how 3D printing and this specific user scenario could accom-modate recycled plastic in a Circular Economy strategy in a feasible way. However, while 3D printing has shown its benefits for conventional industry environments, the first issue discussed in this paper is whether 3D printing technology can also bring benefits to the maritime‐port sector, where parts manufactur-ing, new prototyping trends and even product customization have not traditionally been major business issues. The European CircularSeas project aims to encourage the development of greener maritime industries through the combination of principles of Circular Economy, plastic recycling and 3D printing. Plastic waste is a major concern for marine environment care, and many researchers and projects face the problem from different points of view.
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