i jus worked on a lil home mad bong.... just used old fasion water bottles, but i'm pretty proud of it, i found a lil tube that the pen (downstem) fits in air tite, so it works like a regular bong, no carb, then i made an ashcatcher out of a lil 8 oz bottle, lol i had some time on my hands. I'm pretty pumped to see how it rips