By the way, the J-Heads sold by Hive76 a few years ago (don't know if they sell them anymore), are those your design as well? I remember when I first had my i2, it had a J-Head from Hive76, which was supposed to be really "top of the line" back then (not sure if this was true, I was a NOOB then). I do remember paying around $75.00 for one, and it worked great for a while until I decided to start playing around with higher temp filament.
Romel