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I have a problem that prints are not orthogonal on the X/Y axis. I created a test object for this, and have found that the x/y axis are not at 90 degrees. I don't have a protractor on me to measure actual angle but my tri-square shows 2 or 3 mm deviation over the 15cm test print. This makes it unsuitable for some of the tasks I have been trying to use it for.

I have attached the test stl I created for this.

Any idea where to start trying to fix this problem?

I have been searching for info for a while and not found much. I was considering rebuilding the whole frame again but wonder if anyone has pointers on things to try before going that far.