I purchased an MB Plus hotend (http://www.thingiverse.com/thing:637748) as I tragically broke my E3DV6 and wanted to try something new. Since I could not get it mounted to my X carriage and couldn't find any designs to get this mounted on my printer, I had to come up with my own design.
I made two designs, one has arms that go into the X backplate and one without the arms and instead M3 nut and bolt slots so you can use the original wooden arms. The design with the arms will print just fine with supports added.
I've also included the SolidWorks part files. I am using a direct drive extruder made by someone over at YouMagine.com, but the original extruder (Wades) that came with the i3v SHOULD work with this design with no issues.
The hotend requires a 5mm mounting plate, the one I have came with the printer but if you purchased yours with an E3D hotend then it would have came with a 6mm plate. You could either buy the plate or print one, I'm sure there are some designs out there.
I will probably improve on the design in the future, but for now it works great.
I'm all over the place today, so I may have forgotten to mention any details. If you need any help please ask away in the comments.
Update: Version 2 of the plate with arms now available. I went back to the Wades extruder and the hotend was sagging way too much so I had to go back into SolidWorks and work on a new design. It much better now with 0 sag whatsoever.