Confused about bed mesh levelling on a delta...



  • So, I run G32 followed by a G29. When I try to reload the height map on my next print using G29 S1 I get the following error

    Warning: the height map was loaded when the current Z=0 datum was not determined probing. This may result in a height offset.

    I read the docs but not sure how to reload the datum as my probe is detachable, so I cant use it when actually printing


  • administrators

    @totalitarian said in Confused about bed mesh levelling on a delta...:

    I read the docs but not sure how to reload the datum as my probe is detachable, so I cant use it when actually printing

    In that case, you will have to ignore the warning. What it's telling you is that your Z=0 setting is relying on the accuracy of the endstop switches, and that may drift with temperature (and perhaps other factors). For example, my delta has aluminium towers, and the endstop switches are nearly 1m above the bed. The coefficient of expansion of aluminium is around 22e-6/degC, so a change in temperature of 10C will change the Z=0 position by about 0.22mm, which is too large to be ignored.



  • Thanks dc42, that makes sense now


 

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