@dc42

One more silly question from the manual bed leveling assistant link: If you know how much the bed need move to balance out, why not just have the duet issue the commands to the independent steppers to move the bed so it is flat?

My bed often gets out of alignment because of powered off sag. When powered down, the slightest bump or touch of the bed can overcome the friction holding the bed in place.

I don't think so.

I am putting the commands in bed.g, then triggering it from the interface by hitting the "Auto Bed Compensation" button.

Is this not correct?

Do I have to explicitly call G32 from the command line?

I am fine with that, but the documentation is fuzzy on this point, as I thought what the "Auto Bed Compensation" button did was call G32.

@dc42 Several reasons.

One, it does not appear to know which motor is associated with which point on the grid. Thus, it does not appear it would actually know which motor to engage to move a corner up and down so that it is level with the other three, it moves the whole plane to account for it. No different than bed mesh leveling

UNLESS, it is required that each of the assigned motors be in the same clockwise orientation required by the probing...

(Whoops. Here it is the process documentation. you linked. I will have to rewire the motors. Ah well. Unless when I define the motors I can put them out of order to match the wiring, like Z1:3:4:2 )

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.

Although the second issue remains: it throws warnings that this method is replaced by the bed mesh leveling method.
Will there be a bed mesh compatible version of the independent Z axisitalicised text

I have multiple Z drives, and want to use this to level the bed by testing each one in turn.

I level the bed
G30

Then move to the corner supported by driver Z5 :

G1 X25 Y25
G1 Z1

Isolate the driver:

M584 Z5
Then attempt to move the bed up until it triggers the probe:

G1 S1 Z-25 f500

That last step does not work as expected. It moves that one driver correctly, but does not stop when the Z-probe triggers but continues to grind the head into the bed.

What am I doing wrong here? Do I need to somehow explicitly assign the standard Z probe to Z5 for it to trigger and stop the motor?

How about a warning that they are trying to use a motor with no current defined?

Steps to reproduce:

1. In config.g, remove the EXXX setting from the M906 line.
2. Restart
3. Heat hotend until extruder controls unlock.
4. Retract hotend.

Following message appears:

This error does not appear if I remove the X or Y settings from the M906 line

I added on a Duex5 so I could do independent Z-axis bedleveling.

While doing that, somehow I removed the voltage setting for Extruder.

When I went to do extrude movements, I got a warning that the stepper wiring appeared disconnected.

I spent a bit of time tracing my wiring, making sure nothing was wrong before I noticed the M906 lacked the usual E600 setting I use.

It may be that, but I am pretty damn sick of breaking IR probe mounts while trying to sort it out.

Can't exactly track down printing issues like you suggest if every 3rd print is a new mount for the z-probe because it has snagged and broken itself off.

So, any suggestions on the chicken and egg problem?

Other than that, I am going to go bltouch, simply because there are dozens of designs that I can try to meet my requirements, and not worried about the large edge area of the IR probe. That large flat near inch wide profile catches on everything from the edge of the model to the more delicate supports

Nor am I skilled enough to make one from scratch, and the large size and unshielded nature of the IR probe makes some obvious solutions much more difficult to modify an existing one.

When I set the z-offset it is only 1.25mm.

This means the board often scrapes the top of models, knocking them loose or otherwise damaging them.

How can I increase the clearance?

Thanks! That sounds a lot better. I knew it would need independent heaters/probes,