@stickstones I have noticed that thier glass are different shapes but never knew about the thicker vapor. Since i am not a glass worker and am not going to be heading that way i can only stick to easily available materials. Modifying test tubes is easy and cheap and best of all easy and cheap to replace if broken! I pay 0,08 cents per test tube so that will not break the bank. The SSV or DBV glass costs considerably more. What i really like about the ceramic heater is how fast it recovers between hits. If i turn it up a but more i can inhale as fast as i can and still get a good size cloud. Slowing it down releases more flavor and thickens up the vapor. Still a few more design ideas and perfecting my glass cutting skills to get completed. So far this vape has cost about $20 in parts and a lot of time!