It's getting gunked up on the inside, and not from anything bubbling over. Vaping bubble hash with the CT, on max power with the PA, has left an oily residue on everything inside, on the screen, rubber o-ring, and the lid. It's really sticky and hard to get off. On the screen, right by the draw hole, it's especially bad, and getting worse the more bubble hash I vape. I'm glad I decided to only vape the bubble hash in the maple LB.