cn; I think that's where the confusion comes, we need to define "ground" as each grinder is different for the same settings........ What you "dont" want, is powder. Every coffee grinder I've seen (you know, the $20-$40 walmart/sears style ones) have always left coarser pieces on the top, and powder on the bottom. I found that my oil would be very black in color, and hit harsher. By hand grinding it just by rubbing my hands together and then stuffing the tube, I find the oil is lighter, meltier, and a not harsh in the least.
With respect to dan and your continued comments, again taken out of context, I wasnt referring to MY extractions, I was referring to YOURS. I run a 2oz tube and use two cans. I use the finger test to determine if there's oil still coming out or not. If your finger is sticky when the butane comes out, there's oil left in there. But nit picking at this "how many cans do you use", we are all missing one important factor, and that is each strain, and each part of that strains material you process is going to have a varying yield and need a varying amount of butane. You should use as much butane as you want/need to in order to get the oil out, no more no less. There's no set rule. If (as the subject of this thread implies) your goal is to simply increase your yield, then run it like there's no tomorrow. Running the right amount is how you get the right quality, short of all the proper purging/waiting after...
And dont give me shit about fridges blowing up. It happens, and you are a plain idiot if you think otherwise.
http://abclocal.go.com/kfsn/story?section=news/local&id=8455907
Watch the video, see the apartment damage in the news story above. Purging BHO in a freezer. BOOOOOM. Sure, it never happens, its safe! LOL...
[youtube]5sjhXK8ohfE[/youtube]
Keep searching on the web and you'll find plenty more........