As for the makerbot extruder, we have become mortal enemies. I ended up buying some components from another company and they worked like a charm. The design has a lot of flaws in it. The one that comes to first to mind is the thermal barrier. This is the thing that keeps the extremely hot barrel and nozzle from melting the device it’s attached to. Makerbot supplies one made out of teflon (PTFE), and teflon is a very soft material. What happened to me (on two teflon barriers) is the barrel wasn’t screwed in tight enough (because it’s so soft, you don’t want to screw it in too tight, or you damage it) and hot plastic got in there and made it impossible to use. The barrier I used is PEEK, it’s tougher. It worked beautifully the first time. The alternative option I used was just so much smoother that I’ve nearly sworn off makerbot alltogether.

So is the extruder which comes with the MakerBot not sufficient?

I liked your tutorial so much that I decided to shameslessly copy it (with due credits, of course) to create the equivalent KiCAD tutorial. In Spanish (sorry), because it’s for my local group. In here in the mean time, and no stylesheet (so it looks a little bit like shit).

http://staff.not.iac.es/~rcardenes/guia-kicad

In the tutorial, the parts came laid out like that as I went through the process. I’m sure if you follow the process you’ll get the parts laid out in the same fashion.