Taz 6 fails to level bed with positive z offset

[CaitlynMainer]

Description

Just installed a BuildTak magnetic build plate, Since the plate mounts on top of the glass the height of the bed is now slightly taller than the washers. Set the z-offest to 0.95 to compensate and the printer now fails to probe on washer 1. set z-offset to -.1 and it can once again level. Flashed to stock 1.1.9.34 and bed levels with no issue with positive z-offset

Steps to Reproduce

1. Set z-offset to non negative number
2. Attempt to level bed

Expected behavior: [What you expect to happen]

Bed should level with positive z-offset, but fails

Actual behavior: [What actually happens]

Printer halts with "Probing Failed" on the first washer

Additional Information

Running patreon build Marlin_TAZ6_SingleExtruderAeroV2_2.0.0.1_0826f028f did not compile, no Configuration.h

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[marciot]

I suspect what is happening is that since you are setting the Z-offset so high, it is affecting the distance the printer thinks it needs to lower in order to probe. You might be able to correct this through the start GCODE. Here's what you can do, after the "G28", put in a "M114" and then use the serial console to record the Z position right after the G28. Then, edit the start GCODE again and put in a "G92 Zxxxx" where the xxxx is the Z value plus or minus a millimeter. This should allow the printer to probe.