Core XY Marlin 2, dual Z motors auto align

Dual Z motors inevitably get out of sync. One reason is that when you power up the printer, each motor will jump to a full step. The two motors may even jump in opposite directions.

This problem can be addressed by the Z_STEPPER_AUTO_ALIGN procedure.

So in this episode, I will walk you trough the activation of this future, in Marlin.

Our test subject is an X5S 3d printer with an skr 1.3 mainboard

[BuzzingGoober]

Why is num z stepper drives missing in the latest Marlin?

[andresqvquezada]

Hi. I have a skr mini e3 v2 and I have the next error. #error "No E stepper plug left for z2!"
Do you know if this board is compatible?

[SteliosLiver]

#define G34_MAX_GRADE *1*
=
1% of ([bed size] - [probe offset]) = 1% of (330mm - 34mm) = 296 * 0, 01 = *2, 96mm max deviation*

The default 5% for a 330 bed with 296mm width between the two measurments, gives 14, 8mm = 1, 48cm max deviation (paranoia)