can't get a good first layer It looks like the live z is both too low and too high in a large z test square  

Re: can't get a good first layer It looks like the live z is both too low and too high in a large z test square

Trying to figure out why I can't get a good first layer on a z test square, anyone understand what's happening? It looks like the live z is both too low and too high within the same square 😩

Reran the XYZ calibration several times
Printed multiple times and it looks exactly the same starts out nice live z at -427 and as it moves across the bed it get worse requiring more - negative live z input up to -550

Firmware is not yet perfect, the first layer still a battle for most of us, including me... Wait some time for temperature to stablize is not work well for me too, not to say when i print ABS it start to print on air... What i do now is live ajust Z by eye when layer not come good i abort and reprint, after 2 and 3 tries i get a good layer and leave it to print, only that way i can print anything... This firwamre bug is what none printer should have!

Re: can't get a good first layer It looks like the live z is both too low and too high in a large z test square

Could be that your bed is wavy enough that it'll be impossible to get the z-height right. That was my problem, and support sent me a new one. Problem solved after wasting a week trying to get the Z height right.

https://shop.prusa3d.com/forum/original-prusa-i3-mk3-f30/warped-bed--t14382.html

Re: can't get a good first layer It looks like the live z is both too low and too high in a large z test square

What are your values for XYZ calibration details, skew and Belt status?
You can find them under Support.