@Danal Thank you for your help. Unfortunately I don't know my rods length and my caliper is too small.
They are not original Hayden Huntley ones but they are the same.
I agree with you, autocalibration is not perfect and the rod length has too much difference after each autocalibration. And I guess that the rod length is the most critical settings for good calibration.
I tried to measure the rod length of each one using this method.
For each tower:
- I fix my caliper on the tower. It's perpendicular to the tower.
- The end of the caliper is touching the head.
- I move the head 50 mm along the axis of the tower to the tower
Tower Y exemple G1 X25.98 Y-15 G1 X69.282 Y-40
- Then I change the setting of the rod length and measure again until the head move the right distance.
Here is an exemple for the Y tower
Not sure than this method is the best one and if it's accurate enough. But I was surprised when I read from one autocalibration quite the same result.
As you can see, printing using this settings shows that the 120° angle are wrong. 100x100 square is not really square and 100mm round piece is not really round as well.
What about manually changing M665 X,Y and Z settings ?