Printing problems... Any ideas folks (5 replies)

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Hi folks we are having a big problem trying to print some helmets

It starts printing ok then it appears to shift to one side, continue then print o one side again
A picture tells a thosend words
Have a look at this

[attachment 15092 image.jpg]

Can't figure if its Pronterface, slicer or the printer ( Mendel 90)

Any thoughts??
Steve & Alex