Hi Daid,
that's the reason why the community is so glad, that you've decided to go to UM.
The picture shows, that your diagnosis was right: one of the both pins was bent to the middle, so that the jumper was loose and brought a defective contact. So the cube wasn't 40mm high, but only a little bit to high.
Now it prints much better and i can print the belt tensioner.
Thanks a lot.
Thomas
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Daid 306
Is the 20mm cube about 40mm in height? That could mean you have a problem with the micro-stepping.
You should check the little jumpers on the Ultimaker electronics. These guys:
Check them with this photo:
The Z should have 2 connected and 1 open jumper.
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