That's a nice tutorial. I already knew about the obsidian generator, but you found a nice and clean way to automate it up, I might be using this setup from now on.
That said, something has bugged me, even though it's not a big thing.
I hope you don't get me wrong, but you sound a little bored, which can be bad as the viewer could get bored as well (I know I did).
I'm not saying you should be like "OMG, HERE'S MY OBSIDIAN GENERATOR, GUYS, THIS IS OUTSTANDING, CHECK THIS, OMG THESE NICE PISTONS!!!11", that would be crappy. But maybe try recording it once you feel you're really inspired and ready to demonstrate your... uh "disposition", for a lack of a better word, to the viewers.
Hope you don't think this is too critical, I actually can relate to the "you sound bored" thing, and it's one of the reasons (a minor one) I didn't record my voice yet. If you think different, maybe if you think it's not a problem at all, then disregard what I just said.
Also it would be nice if you checked out my channel. Only one video atm, but more to come.
