So, I tried the infamous (at least on the internet) diet coke and mentos thing a couple days ago. It was reasonably amusing, now I'm curious about some variations on the theme. Which in turn got me thinking about dry ice making attachments for CO2 tanks. Being a law student, and therefore, cheap, I don't really want to buy one. Having access to machine tools, I want to build one instead. So, if anyone has a diagram, plans, or one that I can reverse engineer, let me know. I *assume* that the making devices just have an orifice above a screen or bag that catches the ice? Ideas?