first layer getting smashed

  • I just wanted to make sure I have the right setting on z homing. My first layer is getting smashed a little. it's not terribly noticeable, but I want to fix it. i use a metal .1mm metal gauge measuring tool to set the z height when leveling the bed. Here is what I have for z homing.

    G91 ; relative positioning
    ;G1 Z2 F2400 S2 ; lift Z relative to current position
    G1 Z-230 S1 F180 ; move Z down until the switch triggers
    G1 Z2 F600 ; go back a few mm
    G1 S1 Z-230 F120 ; move slowly to Z axis endstop once more (second pass)
    G90 ; absolute positioning
    G92 Z0.1 S2 ; tell the firmware that we are at z=.1mm

    It moves off the z end stop, so I know it is going higher than .1mm. Is something wrong in the homing file?

  • administrators

    That looks correct to me, assuming the Z endstop triggers when the nozzle is 0.1mm above the bed.

    If you home the printer, then move Z by +5mm and then -5mm, is the nozzle still 0.1mm above the bed?

  • It works like you suggested. Perhaps the gauge is measuring out less than .1mm when leveling as I am leveling to where I feel slight friction on the gauge. So it's really at .08 or .09. i'm going to try a larger gauge and see if that corrects things. Thanks.

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