The problem I am having is that the bed leveling (G29) is saying that there is a 3mm difference between the outside of the bed and the center.
I have been rebuilding a Little Monster Delta printer for the last year (it has been slow going). Almost nothing other than the frame is stock at this point. It has a duet2 ethernet board, NEMA 23 0.9 deg motors (23HM22-2804S) with 40 tooth gears, and an induction sensor mounted for bed leveling, with a new magnetic steel bed both to make printing easier and to make the induction sensor work.
My config is using M665 L397.107 R175.000 H520.000 B165.0
for the printer dimensions, which I fairly certain are correct, and M92 X160 Y160 Z160 E410
for the motor settings which I am also fairly certain are correct. The sensor settings are as follows:
M558 P5 I1 R0.4 H4 F1200 T800
G31 P500 X0 Y0 Z0
M557 R80 P8
Running G29 demonstrates a 3mm height drop from the center of the bed to the edge in any direction. When I change the height in M665 (increase to H540), and reduce the X/Y/Z in M92 to 156, the printer register a deviation change of roughly 20% (flatter). Using a straight steel ruler and a flashlight I can clearly see that the actual deviation is far less than 1mm (likely in the 0.1 to 0.2mm range). In theory I could fix it by providing incorrect values for the height and travel, but this seems like it would create other problems down the road (such as incorrect layer heights).
I am struggling to figure out what is going on here. Any ideas would be most helpful.