Hi,

Thank you for the help.

I am certain z axis is not missing steps, I can see both motors turn continuously in unison. Also, they are bone cold, like room temp cold.

The motors are wired separately to the ramps 1.4, the ramps has two rows of 4 pins each for a z axis motor. Each motor goes to one row of pins.

I am not sure what vref is.

Both steppers seem to be working just fine, print quality is fantastic once it gets the correct z offset.

I feel like I am chasing my tail, the z offset changes. Sometimes it will remain consistent for a few prints, and sometimes it wont even remain the same when I reset my ramps and go to restart a print. I can see my LCD screen, z offset always remains the same NUMERICALLY, but in reality something is causing my nozzle to either air print, or dig 3mm into the bed very frequently without notice or an understanding as to why.

I hope I can solve this problem soon.