Unfortunaly the wiring of the Z motors are correct.

@kraegar I played around with the mesh and noticed the following behavior: if i put the gantry at one point down (rotate for example Z4 motor) the Z value on this point increase. Is the behavior correct, should not the Z value decrease?
Edit: Sorry, the behavior is correct, it was my mistake.

@samlogan87 said in Problem with gantry leveling (4 z-motors on voron2):

@fcwilt
How many iterations of the leveling do you do? I found I had to run it 2-3 times (I have a macro that does it) with mine to get it bang on. I am running a piezo probe and it is only out by 0.003mm after running it 3 times. When I run mesh leveling after it seems to coincide with what I get with the leveling. I am also doing it with 4 motors however. Measuring the distances must be done really accurately as well. I spent quite a bit of time doing it.

I can only do one iteration without any problems, at the second try I have to worry about my printed parts from the gantry.

@dc42 said in Problem with gantry leveling (4 z-motors on voron2):

@npukol, that config looks correct to me, provided that you really do have the Z1 motor connected to driver 5 and so on, and +X is towards the right in your diagram.

Which firmware version are you using?

I'm using the latest version: 2.04RC1. But I also tried it with versions 2.03 and 2.02.

Using 4 leadscrews to level the bed or gantry only works if the mechanics has sufficient flexibility to twist in response to differential adjustment of the leadscrews (which is why rigid mechanics and 3 leadscrews is normally preferred). The first adjustment shown in your original post is very large, 7mm to the front left motor and -3mm to the rear left one. This indicates that the leadscrews need to impart a significant twist to the gantry in order to level it. Are you certain that the motors can make that correction without the leadscrews binding?

Manually aligning the gantry works and the gantry is also flexible enough. The problem is that without power, the rear motors (Z2, Z3) go down a bit because of the weight of the XY motors on the gantry.

The leveling itself works, only the adjusment is wrong. In my opinion, this may be due to the wrong mapping of Z motors or the direction of the adjusment itself. I have no idea how to fix this (I will check the connections of the Z motors tonight, i realy hope i find the error there).

Thanks

I've tried severel values for the z motor mapping and forgot set back the right values. The correct order looks like this:

M671 X-55:-55:405:405 Y-5:430:430:-5 S20       ; Z drive positions

The M671 command come direct afte M584 command. The picture below shows the real mapping of the z motors.

The z motors connected to the DueX board as follow:
Z1 = DueX E2 Motor (Drive 5)
Z2 = DueX E3 Motor (Drive 6)
Z3 = DueX E4 Motor (Drive 7)
Z4 = DueX E5 Motor (Drive 8 )

I hope thes helps. Thanks

I'm trying for several weeks to bring the gatry leveling on voron2 to work. Here the result of two runs of leveling, as you can see, the result has become worse as before:

Leadscrew adjustments made: 9.244 -13.301 -0.916 0.690, points used 4, deviation before 3.836 after 0.000
Leadscrew adjustments made: 7.526 -3.585 1.419 2.157, points used 4, deviation before 3.058 after 0.000

Here are relevant parts from my configuration

M667 S1                 ; corexy mode
M208 X-5:355 Y-4:354 Z0:500 S0
M574 X2 Y2 Z0 S0        ; endstops

M584 X0 Y1 Z5:6:7:8 E3               ; motor bindings
M671 X405:405:-55:-55 Y355:-80:-80:355 S20       ; Z drive positions

M569 P0 S0      ; X motor direction
M569 P1 S0      ; Y motor direction
M569 P5 S1      ; Z1 motor direction
M569 P6 S0      ; Z4 motor direction
M569 P7 S1      ; Z2 motor direction
M569 P8 S0      ; Z3 motor direction

and leveling commands

G30 P0 X50  Y50  Z-10000 H+0.00
G30 P1 X50  Y300 Z-10000 H+0.00
G30 P2 X300 Y300 Z-10000 H+0.00 
G30 P3 X300 Y50  Z-10000 H+0.00 S

Does anyone have hints about what I'm doing wrong or what else I could try?
Thanks