Hi folks,
I have a maddening problem. I recently updated my firmware to support bed autoleveling. The autoleveling feature was working great, when suddenly I noticed that my prints were being printed at an offset of roughly 50 units along both the X and Y axes. So normally if my print is centered at 100,100, it becomes centered at 150, 150! This didn't use to happen, it started seemly at random. I had already had a weeks worth of perfect prints from my printer. I simply tuned the bed autoleveling points and did a firmware update. I didn't touch any other values.
I have tried doing a G1 Z0, and gotten a very strange noise from the motors, along with x and y axis movement!!
This led me to believe that the issue was with the "safe z homing" feature, which causes the hot end to end up at x_max/2 and y_max/2 after a G28.
My "starting gcode" is simply:
G28 X0 Y0 ;
G29 ;
I have another clue. After doing a G29, then an M114, the position reported is roughly -40 for the x axis!! What the hell? How is that possible? Doing G1 X0 Y0 Z0 seems to counteract it, but this is a really ugly problem.
My only guess is that there is a bug in the Marlin firmware somewhere.
Any thoughts?
Thanks!
