Amazing 3D-Printed Radio Works, Despite Having No Battery or Outlet Plug:

Did you know you can build your very own working 3D-printed radio -- without any soldering, electronics experience, electric cord, or even batteries? That's exactly what talented Houston, Texas-based 3D-printing and electronics enthusiast Sage Hansen has created. And he's willing to show you how to do it, too. Called a crystal radio receiver, or sometimes a "cat's whisker receiver," this is an incredibly simple type of radio receiver that was popular in the earliest days of radio. The only power it requires to work is the received radio signal, which is used to produce sound. It is named after its most important component, the crystal detector or diode.

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