Dual Z axis on SKR 1.3
by GnattycoleNot sure if anyone has successfully cracked this but I'm trying to set up a dual Z drive using the E1 port as a Z2 stepper driver. It seems to be driving ok apart from the steps per unit seem to be out. i.e. one of the motors is turning further than the other per demanded distance and the bed goes out of true.
I think it's because it is picking up the steps per unit from the E0 which on my config is 500 as opposed to 400 for the Z (X,Y,Z, E0 {80,80,400,500} I tried adding the E1 value of 400 but got a compile error stating Too many values for default axis steps, had I enabled DISTINCT_E_FACTORS. I did enable it but the error message persisted each time I attempted to compile. Also, when I run a M122 command in Pronerface, it doesn't report the 5th stepper driver which is a TMC2208 V3.0 un UART mode. (They all are). Not sure if it's supposed to when dual z axis is enabled in config_adv.h but I don't think I've missed any other settings.
This is frustrating as it's so close to working now. I wanted to enable the dual axis so the bed would home flat using the ABL probe. I've got an 8mm aluminium plate fitted for a heat bed so it tends to drop unevenly once the steppers are disabled.
Any info appreciated folks.