Battery-operated e-cigarettes hit the US market a couple of decade ago, touted as a safer various to traditional tobacco cigarettes. However, they did not really acquire traction until 2015, when Juul Labs debuted its discreet USB-size vaporizer and quickly turned the industry leader. 3D printing — the method of synthesizing a three-dimensional object — is a type of technologies that edges ever closer to mainstream use every year. We’ve seen the concept play out on TV and in movies for years, and now with residence 3D printers it is finally rising beyond a wildly exotic interest for a small enthusiast…