Unanswered Z-Axis Fun -- Problem Out Of Box

Alright.

When it arrived right out of the box, brass nuts for the Z-axis drive were disengaged, the auto-level was hanging off of both sides and the entire extruder/z-axis assembly was cocked. Stuff happens during shipping, I get that.

I took it apart and made it look like my other Robos, however my Z-axis is still slightly tilted to favor the right side.. Meaning I can start with the nozzle touching the bed and by the time it hits the center it is a mm above the bed and higher at the extreme end. I've tried adjusting it by hand (positioning the brass-nuts) but it seems to want to revert to this state.

When I print it prints ok, it seems the autolevel compensates for that, I'm tempted to not worry about it... but I have another issue. Mainly I have to run an enormous negative Z-axis offset to get the first layer to stick. After it autolevels it tends to air-print 2-3mm off the bed. I can cheat it by setting S3D with the appropriate offset.

This I would like to fix the right way. Maybe it's all related and we can clear it up in one go.

 

maybe a few pictures could help understanding the reasons behind all this

 

Hi I did Mark did but used Business cards to assist in leveling. hope that helps