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X Y axis are not perpendicular

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I have a new UM2, about a month old, and finally I managed to calibrate it well enough that I get really nice prints.

The problem is that the X and Y axis are not perfectly perpendicular to one another.

Instead of a square I get Parallelogram shaped parts. it's very light so it's hard to see, but when you put it in a CNC frame it won't fit.

Here you can see that the 2 parts perfectly fit when they are orientated the same as they were printed.

Both X axis are in the same direction and the Y.


Here you can see the perpendicularity problem if I rotate one of the parts 90 degrees.


So I don't have 90 degrees and I get parts that are like this:


What can I do?

Please help.



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I usually square things up by doing the following:


  • Move the head to the front center, all the way towards you
  • Look at the distance between the right sliding block and the closest pulley, compare this distance to the left one.
  • If they do not match, loosen the pulleys on one side so that that sliding block can be moved without affecting the other.
  • Adjust the distance so that it matches the other block.
  • Re-tighten the set screws, and tighten them very very well
  • Repeat if necessary and then move on to the other sliding blocks


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