Layer misalignment is generally caused by missed steps. There are a few common causes:
- Stepper driver adjusted too low
- Belt too loose on stepper gear.
- Extruder nozzle hitting the object while printing. (part lifting/curling)
- Interference in motion of the X or Y carriages.
- Attempting to print outside the physical X/Y limits (switch engaging)
- Error in gcode (uncommon)
Hope this info helps!
-David
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