If you've spent time with a 3D printer, you know: plastic waste adds up fast. Brogan M Pratt and his students found an elegant solution—they built a shredder powered entirely by pedaling a bike. According to Hackaday, the project transforms human-powered mechanical energy into a practical recycling tool, turning mountains of plastic scraps into manageable material. It's the kind of maker problem-solving that turns a nagging problem into an elegant feature.

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