Max, I am using the standard AC cord now, last night and every time it combusted. Even the AC from the video was a 12v from Underdog. Since the lip(bowl) is so large/thin it is easy to smash broken material in there enough to restricts air flow and super heats to combustion temperature. So im gonna try with smaller nuggets should solve the problem. Also not to sound like whiney bitch reporting everytime I combust a bowl either; just providing critical feedback.