Initially the end effector was the thing that everybody thought was unique about this printer. In the end this has turned out to be the weak point in the design. There are relatively few fans options in that size and they are really inadequate for cooling in general. Also, there is no way to add any of the more common "new" hot ends to this effector. Folks are designing a new, printable, end effector that will overcome this but then you are looking at a printer that has very little to offer over any other delta and at twice the price! Take my advice and roll your own. It isn't that hard. You should easily be able to source all the parts for under $500.

I'll stop now but could go on and on. As I said before, my KP is working fine but I can't recommend it.