Problem with negative Z-probe trigger values

Laurman

Hi,

After upgrading to the v1.19 I encountered two bugs:

My CoreXY X and Y axes were flipped - had a easy fix by changing the motor directions
Homez.g and homeall.g files do not recognize negative G92 Z- values. If the trigger height is set negative, Duet completely ignores it and sets the value to zero. Everything works correctly when I use positive values, Duet recognizes it and uses it as it should. Unfortunately I need negative values to get my nozzle probe working again. Deployprobe.g and retractprobe.g files are deleted.

Thanks for your time.

dc42

#1 is documented in the upgrade notes.

Regarding #2, if you are using a Z probe for Z homing, you should not be using a G92 command. A G92 command is only needed when a Z endstop switch is being used, and the switch trigger position is not the same as the axis limit.

Laurman

Thanks for the quick reply. I replaced the second G1 commands for Z-homing with G30 and stated the necessary trigger values in config.g. Now everything works as intended.

dc42

I'm glad you got it working. If anyone does need to use G92 with an axis position outside the M208 limits, I suspect it can be done by sending M564 S0 before the G92 command to suspend axis limits, and M564 S1 afterwards to restore them; but I haven't tested this.