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+# Z related problems
+
+## My print seems to have *blobs* on corners
+![Calibration cube with corner blobs](../img/z/calibration-cube-corner-blobs.jpg "Calibration cube with blobs")
+
+This can occurs for multiple reasons, if no matter what you change on your printer this keeps happening check your slicer.
+
+For instance in Cura I have :
+
+![Calibration cube with corner blobs Cura preview](../img/z/calibration-cube-corner-blobs-cura-preview.jpg "Calibration cube with blobs Cura preview")
+
+You can see for consecutive layers the starting points are aligned. This can cause an amount of material to accumulate and create the blobs.
+
+*Retraction settings might help to prevent the leaking and reduce the quantity of material accumulating.*
+
+Another way to prevent this corner to be the starting point for too long **in Cura** is to change the *Z Seam Alignment* in the *Walls* parameters :
+![Z seam setting in Cura](../img/z/cura-z-seam-setting.jpg "Z seam setting in Cura")
+Changing to :
+![Cube preview with Z Seam Randomised](../img/z/calibration-cube-corner-random-starting-points-cura-preview.jpg "Cube preview with Z Seam Randomised")
+Once printed (*with a low quality printer*): 
+![Printed Cube with smaller blob](../img/z/calibration-cube-smaller-corner-blob.jpg)
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