Z Driver assignments Voron 2.4

SpeedyDad

Sorry for this rudimentary question.

In the documentation for configuring 4 driver Z axis, it references rear left, rear right, etc. Is this looking forward from the back of the machine or looking back from the front?

I know it really doesn't make a difference in normal use but for 4 corner leveling using my BLTouch, it definitely needs to be correct.

Thanks

soare0

@SpeedyDad I configured mine like looking forward, as you normally work with the printer. However, you need to have the wiring right, and the mapping right, of course.
It worked ok.

SpeedyDad

@soare0 OK, looking forward from the back. Kind of what I thought. I wired it front looking back and thought "that can't be correct"

Phaedrux

https://docs.duet3d.com/en/User_manual/Connecting_hardware/Z_probe_auto_levelling

See the prerequisites here, particularly

You must use the M671 command to define the X and Y coordinates of the leadscrews. The M671 command must come after the M584 command and must specify the same number of X and Y coordinates as the number of motors assigned to the Z axis in the M584 command; and these coordinates must be in the same order as the driver numbers of the associated motors in the M584 command. The M671 command must also come after any M667 or M669 command.

SpeedyDad

@Phaedrux Yup. This printer in its previous life was a dual Z setup so I am familiar with that but I will have to wrap my head around setting M671 up for 4 Z axis.

Phaedrux

It's the same as with 2 drivers, just need to have the order of the drivers used for each motor in M671 match the order used in the Z mapping of M584.

The positions you probe and their order are arbitrary and defined in your leveling macro.

soare0

@SpeedyDad
Maybe this helps:

; Drives
........
M569 P0.2 R0 S1 T5:5:10:0                        ; Z0 drive 0.2 goes backwards
M569 P0.3 R0 S1 T5:5:10:0                        ; Z1 drive 0.3 goes backwards
M569 P0.4 R0 S1 T5:5:10:0                        ; Z2 drive 0.4 goes backwards
M569 P0.5 R0 S1  T5:5:10:0                        ; Z3 drive 0.5 goes backwards
M569 P1.0 R0 S0 T5:5:10:0                        ; extruder drive 1.0 goes forwards
M584 X0.0 Y0.1 Z0.2:0.3:0.4:0.5 E1.0               ; set drive mapping
M671 X-70:-70:670:670 Y70:530:530:70 S0.5		  ; POSITION OF LEADSCREW FRONT LEFT, RL, RR, FR
M208 X0:524 Y0:600						  ; Xcarriage move, Ycarriage move