Z Offset is always too far.



  • Hello,

    Even after carefully calibrating the Z-probe and setting the Z-offset at Config.g, or manually sending very aggressive Z off-set values with G31 with the console the nozzle is ALWAYS too high..............

    I always need to "baby step" the first layer. If I home Z and send the nozzle to the probe position and to Z=0 it is too far from the bed. What am I doing wrong?

    Config-override is clear and only contains PID data....



  • Just as a teste a did it again:

    Cleared the mesh, calibrated the probe, home all and send the nozzle to the probing position and Z=0: there it is the nozzle almost 1mm high... Always the same more or less amount too high.

    G30 S-1

    Stopped at height -0.551 mm (more or less always the same value...)



  • Probe type and configuration? Firmware version?



  • @phaedrux I think I just found (your) answer 😄 to the issue at https://forum.duet3d.com/topic/5097/z-offset-issue-probably-me/8

    I'll try it....



  • @phaedrux said in Z Offset is always too far.:

    Probe type and configuration? Firmware version?

    Probe type 5 (servo deployed with optical endstop connected to Z_Probe_In)

    Firmware Version: 2.0(RTOS) (2018-06-05b3)

    Issue is probably related to my home Z or home all macros.......

    ; homez.g

    G91 ; relative positioning
    G1 Z5 F4000 S2 ; lift Z relative to current position
    G90 ; absolute positioning
    G0 S0 X119 Y140 F4000 ; move to center of bed
    M98 Pdeployprobe.g ; deploy mechanical Z probe
    G91 ; relative positioning
    G1 S1 Z-295 F1800 ; move Z down until the switch triggers (first pass)
    G1 Z5 F1800 ; go back a few mm
    G1 S1 Z-295 F180 ; move Z down until the switch triggers (second pass)
    G1 Z10 F1800 S2 ; lift Z relative to current position
    G90 ; absolute positioning
    M98 Pretractprobe.g ; retract mechanical Z probe

    I am not using G30 as you mentioned at the above link 😄



  • That could very well be it. You'll also be able to remove the manual M98 calls to deploy and retract the probe as G30 should take care of that automatically.



  • @phaedrux Just realised that when testing the new homing macros. Will do.

    Thank you.


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