[SOLVED] Layers not aligning on Y  

[SOLVED] Layers not aligning on Y

Hi all,

I've recently bought an Original Prusa MK3 kit, it's my second kit printer and I just finished assembling it.

The printer autotest ran without problems giving all OK, the first layer calibration also ran flawlessy.

But when I started my first prints I've noticed there is an align problem on the Y plane

The one on the right is with Crash Sensor turned ON (you can see the Y slide on the bottom part below PRUSA), the second one is in Stealth mode, so without Crash Sensor and it has those zigzags at the bottom (still Y slide)

On this side image the Y slide is more evident

I'm running on the last Firmware, I tried both Slic3r PE and Simplify3D and they get the same error

I checked the Y belt tension and they look ok with the pulleys free to move

I'm using the magnetic steel plate

Any ideas?

(more photo of a simply round object)

Thank you,

Robert