Heh... I think it was a bit earlier. The Groovemount was the "standard" for a while there (Makergear, Jhead, etc) then when E3D came in they used the same idea

Heh... I think it was a bit earlier. The Groovemount was the "standard" for a while there (Makergear, Jhead, etc) then when E3D came in they used the same idea but changed the measurements. It was pointed out to the devs...they left it the way they modified it. So E3D was incompatible with the mounts that were the "standard"...others later followed and also made their own mounts. The E3D clones advertised themselves as "jheads" and "E3D" when they were neither...rode on the popularity of other hotends via false advertising. It also happened with the electronics that were popular at the time leading to a lot of issues when people were confused about what firmware would run on the boards they purchased.