If you grew up sometime between the mid-1970s and 1980s, you probably recognise these plastic discs. They played songs like "Twinkle, Twinkle, Little Star" on Fisher Price's plastic toy record player, but did you know you can actually create your own custom discs if you have access to a milling machine?
That's exactly what Instructables user fred27 has done, and he's been kind enough to put together a full tutorial on how he did it. Unfortunately, very few of us have access to a milling machine, which is needed to make these a reality, but there's no reason the steps can't be adapted to use a 3D printer instead.
He's even created a custom app for creating whatever music you want on the disc. Because let's face it, the chances of Fisher Price reviving this format and releasing new songs are non-existant unless we can somehow convince the hipster community it would be even cooler than vinyl. [Instructables via The Fancy]