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TH3D EZABL not levelling, if anything making it worse.

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hello
i have an old EZABL that doesnt seem to be working on my CR10 mini with Melzie board
running latest firmware and start gcode. it probes ok and deviation is very low but after it does a G29 and starts printing the test stl it is ok at the front of the bed, trying to inject into the glass in the middle, and seems as much as 1mm out at the back of the glass. its almost like it needs to invert the numbers its using
im using 4mm float glass from a local window shop
ive got solid mounts and doing a bed tram i found the bed is very level. maybe 0.2-0.3mm front to back
the gantry for the extruder is within 0.1mm level
i think if i didnt use the G29 and just manually levelled it would probably print better.

I would post your question in their discord https://discord.gg/yNkSvKsu