Here’s a simple, but powerful, coil gun made from the flash circuit of a disposable camera, a large cap, a coil of magnet wire and an ink pen shaft (and a few other parts). I like the use a light switch box as the project box.
Gareth Branwyn is a freelancer writer and the former Editorial Director of Maker Media. He is the author or editor of a dozen books on technology, DIY, and geek culture, including the first book about the web (Mosaic Quick Tour) and the Absolute Beginner’s Guide to Building Robots. He is currently working on a best-of collection of his writing, called Borg Like Me.