Freight Train
mods has one, and only one model but they're super expensive. Here's his link:
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Smaug is the only one. They're currently oversold and not taking any orders, which tells me people love them.
I'm currently in prototype mode on a regulated wood pipe 18650 mod with a DNA40 chip in it, I plan on taking to market. I have searched and couldn't find anything I wanted so I figured why not build it. I know there's tons of capers that would love a nice pipe mod and not have to sacrifice dense clouds and horrible battery life. Awesome job on this mod!