I bought lengths at the hardware store. It was a little over $1 a foot. You can have them cut it down to the length you need so you won't have to buy a big giant long pipe. I used 4" and 1.5" pipe. My ...

This article was taken from the November 2014 issue of WIRED magazine. Be the first to read WIRED's articles in print before they're posted online, and get your hands on loads of additional content by ...