Hello ,this is my first post,need a bit of help,have Corexy I built from a migbot, i have the mks 1.4 , any way my problem is I have z1 z2 x y E0 ,the z2 is running off of E2 , I what to add a diamond hot end,I have tried the pins on the aux 2 for the expansion board but it's a no go,I want to run z2 from external board but cannot get my head around it, any help would be great thanks