I created this based on someone's else design here http://forums.reprap.org/read.php?406,484958,507546#msg-507546. This is just an extruder mount to make the mk8 compatible with j-head groove mount also compatible with the link to the original design.

The original design were off to the right by the designer because he wanted to have the motor rest on the hot end mount but I don't prefer that because I would lose some print volumes by about 5-10mm (which isn't that great to be honest).

So I just trace along all the lines and recreated another that sits at the center (slightly to the left of original mk8 mount position by about 3-5mm) so that I don't have to mess with the printable area for x axis. For this, you just have to take out the existing fan and heatsink and reuse the longer screw again

As of now, this design would remain as experimental until I get my e3d although I already have all metal j-head, but keep changing hot ends would require a lot of calibration and rewiring to be done. But this item should work fine.

I only redesigned the groove mount for mk8 extruder compatible. The e3v lock and x carriage are not my design, I take no credits in these 2 item

Anyone who are going to print this item and tested it, please let me know in comments below so I could make some changes or something

Also,, this uses 25mm length lm8uu

v2 available here http://www.thingiverse.com/thing:893941
v3 here http://www.thingiverse.com/thing:905619