I have a fever, and the only cure is more RepRap.
This isn't quite true.
@Forest HiggsWell, no, it's exaggerated for attempted comedic value.As an example: Myself I have no problem with hobbing a drive bolt for the extruder, but it does take a few tools and a little testing to get right. Some people does not possess the tools or interest, and would be better off buying a "professionally" hobbed bolt. Giving advice is not always easy. :)And of course, commercial hot ends are not scams. (At least not the ones that work).