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I have make a little test with 4 dots aligned with A tower, B and C tower. Distance W and S are the same in the stl but not in the print. I have tried diferent values of diagonal root but S always is smaller than W, and all S are equal (more or less 38.20mm) and all W are equal (more or less 40.80). I expect that W and S will be 40mm. How can fix this problem?

**Update:**

Here is the stl I use: https://www.dropbox.com/s/2vwjbo387cmk5qa/DeltaCalibration%20v15.stl?dl=0

**Update:**
I have replaced the steper motor in tower B but same result.

Can you draw positions of the towers? What are the absolute values (expected and actual)? – Mikhail Z – 2017-09-19T16:21:16.240

@MikhailZ I have updated the question with the towers position, actual and expected values. – TlmaK0 – 2017-09-19T16:36:24.493

Are your rods all the same length? – Gunslinger – 2017-09-22T10:16:57.157

yes, I have checked again – TlmaK0 – 2017-09-22T10:23:58.770