Crystal Radio Tube - two parts
thingiverse
Josh Burker constructed a crystal radio receiver, using printed plastic instead of a cardboard toilet paper tube for extra strength. Although his 3D printer couldn't print the entire tube in one piece, he managed to join two parts glued together. The model was designed with Tinkercad and can be edited online. One can also use a conventional toilet paper roll for this project. Instructions on building a crystal radio are available on Josh's blog, along with his personal account of the process. You can access it [here](http://joshburker.blogspot.com/2014/01/building-crystal-radio-receiver.html).
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