Here is a mounting bracket to mount E3D hot end to Anet A6 carriage using existing screw on the bottom of carriage and M6 X 30 throat sticking at the bottom.

Props: fast and easy way to print with e3d titan hotend without rebuilding whole x-carriage.
Cons: you will loose some printing height.

Assembly: Unscrew the screw at the bottom of x-carriage, remove old hotend, but leave M6 throat with nut at place. Remove bowden tube fitting from e3d and place M10-M6 adapter inside. Screw hotend on to M6 bolt, then insert mounting plate (i heated top of e3d with hot air) and tighten the screw to the carriage.