I started a topic about a problem during leveling but the real problem was that the Z axis is loosing steps as addressed by nopick.
To keep some order in the forum I have started this new topic with the real problem Title.
Here is a example of the results that I am having… as you can see the problem is not always present at the same Z but some kind of random…
Piercet, The printer is lubed and aligned, the screws of the z axis couplers are OK
I got a couple of good prints at the beginning so I do not think that the motors are not aligned…and the connectors seems to be OK.
Could it be something related with the firmware?