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(all in 1/100th mm)
(where there are more than 3 measurements in a line, that's the approx location of the max value)
Which implies I have roughly 0.2mm in the X rails, and 0.2mm / 0.3mm in the Y
It's quite possible that I can easily sort the X rails by loosening the rail mounts and seeing if the rails themselves deflect upwards when not held down (which would imply a bend in the right direction when tight). That I can fix by mending the mounts gently to eliminate nearly all the deflection. The Y rails are mounted differently, so I may leave them alone unless I have to.
But that's a job for tomorrow!
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So I thought about this, first, there's how flat is the bed? Then, does it move, ( yes, it's heated, it moves, but likely not "that much" ) then how straight are your rails and ...
Then I thought "this is what software compensation is for". You should be repeatable, the loads don't change that much, ( and the measurements are the same coming from either direction? your Z axis acts nice? - Hmm, another potential can of worms, there's likely some "shimmy" with Z motion that affects all 3 dimensions. )
Oh, occurs to me, if the bed isn't flat, a 4mm sheet of AL. would be easy to scrape in. ( But that's the machinist cutting back in. )