possible cause is lose belts.
Check if the long belts are tight (they should make an *ploing* noise) and the small belts should be really tight. These can "jump" over the pullies if they are not tight enough causing the exact problem you have. I had this same problem because of a lose small belt in the Y direction.
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ddurant 0
Almost definitely caused by your motor losing some steps.
Common causes for this include:
- your x/y rods not being lube'ed
- too much extrusion, which can cause a blob and mess things up when the head smacks into it
- too fast feed rate..
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