This is how I do it. I run XX of bud, ground up in coffee grinder. Put in my tube. Wrap it in plastic wrap. Then I put in the deep freezer for a couple hours. Blast it into an 8x8 Pyrex dish. Hot/warm water bath. (Although in the past i have also just swirled it around some and blew on it to get it to evaporate. ) Once the tane is gone, I put in my pre heated over @ 170(lowest setting)for about 20 minutes. Then I cut the oven off and let stay in there another 20 or more. I've read that 170 is too high. But my bho has always been flame...however I have only smoked my own bho. Never had any done by other people. So I don't have anything to base my opinion on. When I use bud only, I have been averaging 15-20% yeild. But only off the first pass. Second pass maybe yeilds %3-7% Any thoughts ? Before oven: After oven: Edit: I actually took a lighter to those bubbles. I was curious to see if there was any butane in them. Nothing caught on fire. I even held it to one spot to see if it would catch on fire and it still didn't. Not sure if this means anything or not. Just figured I'd add the info.