3DR FSR Auto Calibration Issues

Hello All,


Long time reader ...... first time poster

I have just finished making my FSR based auto level system based on the arduino nano and have come into one fairly big problem.

The Z axis is slanted, from back to front it is nowhere near level, at the Z tower the hot end digs into the print bed and between the X and Y tower its a few mm above the print bed. The auto-calibration runs fine (hot end just touched the bed and then backs off in the grid shape). I was thinking it many be skipping steps on the Z motor but every calibration matrix at the end looks almost identical.

I am using marlin dev, synced last about 5 days ago.


Anyone have suggestions on what this could be ?


Also the nano makes for a nice cheap FSR interface board, ill probably post the design and code after i get this sorted




Thanks In Advance.