Well in the home position doing that doesn’t change the head position at all.
However the display coordinates on the touchscreen show a change in Z from 330.01 to 335.16
So i can confirm the mesh is on at all times if the screen is to be believed.
With the mesh off i still get the same issue.
I enabled backlash compensation (it has been off for all of the tests) which sets the Z backlash to 0.06 based on tests a while back using a dial meter. = Same issue.
checked for any looseness on the x and z rail mount points and head mount points, can’t find any looseness.
So I just took this video… what do you see when looking at it… https://youtu.be/a4XPAdSCEP4 …