Yes, you have backlash - caused by the belts being too loose - most likely the short belts. Also, an infill overlap of 15% should be plenty - maybe even too much. Even at 15%, with certain geometries, the infill can start to protrude through the wall.
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anthonyt 0
Are you sure it is not loose belts? Check out this posting:
http://umforum.ultimaker.com/index.php?/topic/1872-some-calibration-photographs/?p=14474
Also note that the back motor (X-axis) cannot normally be moved down low enough to tighten the short belt and the holes in the wood may need filing at least 1mm more downwards.
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