Have a look at this part way print:

Layer 2.6 labelled.jpg
That's a scan of the object and I didn't get it square on the scanner.


The black lines show the extrusion that was laid down as Layer 7 began to print (Z= 2.6). It was exactly 7mm down the Y-axis from where it should be. X position is correct.

This is the Gcode for the print:

Z-axis LHS plate.gcode

This code printed OK last night, except for a corner lift. The bad print happened twice today. I've just done maintenance on my printer and the belts are tight. Remember that the first 6 layers printed correctly.

Given that the room temperature where I was printing was 36C, could I have an overheat problem in the Y stepper? But the X stepper was operating under the same conditions. Both X and Y steppers were working hard as I was printing linear infill at 45 degrees.

Any ideas as to what gives?

Old Man Emu