This is my take on the E3D V6 hot end mount, originally designed by Lawsy and modified by Wardjr so all credit goes to them. This version uses screws and a bracket to hold the E3D V6 hot end very tightly, eliminating all wobble.
Update 08/17/15: If you have upgraded to an E3D hobb goblin drive gear, a new tension arm is required. This file is now attached. It still uses a 625zz bearing, M5 bolt cut to length, and 2x M5 washers. I highly recommend this upgrade, it added even more resolution to my prints.
Update 11/11/14: I added the filament guide and tension arm STLs, originally designed by Lawsy, just so that everything you need is in one place.
Update 11/18/14: I downloaded the files and noticed that the bracket was not printing right. I'm not sure if others had issues but I ran it through netfab and it was fine after that. I have now included a fixed version in the downloads (look for FIXED at the end of the filename).
Print it with at least 3 perimeters and a high percent infill for strength. You need some longer M3 screws, I used M3x30 mm and they were just right. If you printer is slightly over extruding, like mine, you may need to put a washer between the two pieces, or the bracket might slightly flex. Run the wires through the loop to keep them tidy.