Нelp me please with leveling bed with two Z axis motors

Dep

In general, it does not work for me to adjust through the offsets in tools.

Now the configuration is as follows - the Z offsets are set in G10. Probe set as reference point:

; Z-Probe
G31 P25 X0 Y0 Z0

G10 P0 X-19.2 Y-46.6 Z2.05 ; Set tool 0 axis offsets
G10 P1 X-20.4 Y67.8 Z2.26 ; Set tool 1 axis offsets

There are two problems.

Calibration according to the instructions "Test and calibrate a Z probe" (https://duet3d.dozuki.com/Wiki/Test_and_calibrate_the_Z_probe) gives the extruder offset about 0.68mm, but if you start printing, the extruder is too high from the bed. I picked up the height by eye and got a value of about 2mm. Ok so it works.

But sometimes for some strange reason, the extruder goes down. See attached photo.

I have repeatedly calibrated the same printers, but with one head and everything always worked out fine.

Therefore, I try to do the old thing - the reference point (Z) is the first extruder. I set the offset for the probe and the second extruder:

; Z-Probe
G31 P25 X0 Y0 Z0.68

G10 P0 X-19.2 Y-46.6 Z0 ; Set tool 0 axis offsets
G10 P1 X-20.4 Y67.8 Z0.26 ; Set tool 1 axis offsets

Maybe I'm somewhere wrong, correct me if that. Thanks!

dc42

If you have 2 tools with different nozzle tip heights, you should set the Z offset of the lower nozzle to 0 in the G10 command for that tool, so that the other one has a positive offset. Then do the Z probe trigger height calibration after selecting the tool with the lower nozzle.

Abelli

I am assuming that you are homing Z the use of a G30 command in homez.g and in the Z homing phase of homeall.g. There seems to be a distinction of round 0.7mm in the mattress peak or gantry top at the XY function at which you probe for Z homing, in contrast to the XY positions at which you probe for leadscrew levelling.

zapta

@Dep, I don't know if it was mentioned here but from my experience, once you do the dual Z leveling, you need to do another Z homing. The Dual Z leveling makes the bed horizontal (good) but may introduce a Z offset.

droftarts

This thread is two years old! Not sure it needs replies...

Ian