Normally when you embark on building a DIY 3D printer you'd search online shops for the best and least expensive components. Bring them together with the right plan and you'll soon have an operating 3D printer.
But that's not exactly what Kodjo Afate Gnikou did. He went to the dump. Specifically, he searched through piles of e-waste to find leftover components to find "rails and belts from old scanners, the case of a discarded desktop computer and even bits of a diskette drive".
With that and USD$100 worth of new bits that could not be found in the dump, Gnikou was able to make a working 3D printer.
What's hiding in your dump?