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The printer is run by a Raspberry Pi attached to a receipt printer and a webcam, with a light.
The light turns on when the room is too dark, shown here: https://beta.pnut.io/@33MHz/posts/688180.
The actual printer: https://www.amazon.com/gp/product/B011KF6GW4.
An early prototype of the Python code: https://gist.github.com/33mhz/69ca1a6a01093754aeb59f6bcb4236b5. It has since been rewritten in PHP using websocket/"streams".
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