marlin problem

[spa_sergio]

I have a problem with my acrylic Prusa pro b
I've printed several pieces . and when I measure the size of the pieces do not match the size they should have .
I proceeded to calibrate and change the values ​​in the marlin, and continues to do the same. ( repeatedly)
change the values ​​from the screen of the Prussian and no improvement .
the real problem comes with the motor steps that I will not come casket up.
that is to say. I motioned 80.11 for example, and the printer does not change , are always to 78.74 . do so with the marlin or directly from the printer screen .
What could be the problem? a greeting

[William]

I have a problem with my acrylic Prusa pro b
I've printed several pieces . and when I measure the size of the pieces do not match the size they should have .
I proceeded to calibrate and change the values ​​in the marlin, and continues to do the same. ( repeatedly)
change the values ​​from the screen of the Prussian and no improvement .
the real problem comes with the motor steps that I will not come casket up.
that is to say. I motioned 80.11 for example, and the printer does not change , are always to 78.74 . do so with the marlin or directly from the printer screen .
What could be the problem? a greeting

It's a bit weird...Take the liberty to ask,did you upload the firmware sucessfully when changing in Marlin and store the memory in LCD when change it in the LCD controller?

[spa_sergio]

testing and from the lcd if you let me change the steps . but not from marlin .
I can change the firmware and even change the directions of the engines. but when I do it from marlin (only steps engines ) does not change .
firmware uploads bien.he I always tried different firmware and also uploads . but the steps will never change

[William]

testing and from the lcd if you let me change the steps . but not from marlin .
I can change the firmware and even change the directions of the engines. but when I do it from marlin (only steps engines ) does not change .
firmware uploads bien.he I always tried different firmware and also uploads . but the steps will never change

The step/mm of all the motors can't be changed???And how big is the diffrence in the object you printed actually with the one you expected before printing?

[spa_sergio]

Over the engines only let me switch from the LCD . Marlin does not change me . the difference in the x-axis is 0.6mm