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Thanks 626pilot. That link has shown me a lot. It has filled in a lot of the gaps in my knowledge. My brain isn't big enough to handle the rest. It has also made me curious about the max error in Z diagram. That illustration is almost exactly what i'm seeing (but exaggerated) so I wonder which part ...

Hi I am new to all this and built my printer a week ago. I have the same problem. at each tower and center all is good but between towers the head is high. It's almost the same at all 3 points so I think my build is square. Now for my thoughts. I may be very wrong and this may have been thought ...