Bed leveling problem

  • Hi all,

    I have a corexy build. XY gantry is drove by 4 belts with 4 Z motors. The gantry will drop down at both end (X400:Y0 and X400:Y400) when power off due to its weight.
    I am using BLtouch as probe as well as Z end switch.
    When I run G29 (Mesh defined by M557 X20:380 Y20:380 S40). The first point to be probed is X20:Y20. This is what the problem is. Because X400:Y400 is much lower than X20:Y20. Point X400:Y0 or X400:Y400 will hit the bottom of my printer before BLtouch hit the bed. Probing stop.

    What is the best way to make G29 start from X380:Y380 toward X20:Y20, in stead of from X20:Y20 toward X380:Y380?

    Thank you for your help,

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