mount your e3d v6 all metal hot end to your taz 4 or equivelant model with my modified design that makes sure everything is perfect! this was modified from the matterhackers website because theirs made the extruder too high for the bed. Mine was printed in PET, but you may use abs or whatever you like, this design works flawless.after printing two locks and one base .stl's you must clamp the two together on the extruder and drill the 4 holes for bolts, once you have the holes insert the screws from the top and tighten the nuts on the bottom. the base then gets sandwiched between the extruder mount and the carriage. This mod allows you to use the e3d hot end without changing bed or anything else.