Mechanical Problem with Brand New SV08 Max Unit, Can't Fix?

This is driving me up the wall, printer and PLA filament calibrated through all of Orca tests, but there is an artifact that shows up every time oriented toward the Z1 (front left) rail. It is a repeating artifact mostly vertical, that ruins all prints. It is not slicer-related, because I’ve printed different models, changed the seam placement, put the seam on random, etc. and has no effect, always occurs facing Z1 rail. Must be mechanical? But it’s a brand new unit. I really don’t want to have to send it back, I need the printer soon. Things I’ve tried are below:

-I have checked all belts (all Z belts and x-y) with a pro belt tensioner and the frequency app all are fine

-I have checked the gantry is totally square and level, with all screws tightened and no missing screws

-I have watched the printer closely and don’t see any drag on belts, etc.

Is this the Z1 stepper motor? What would cause this type of issue?

Thank you for any help!

Since there are 4 rods, can you post a pic of the MAX pointing to what you are calling Z1 ..??
(I don’t own an SV08)

No problem, the Z1 is the front (closest to user and front display) to the left of that display. So facing the printer, the front, left rail and belt (not screw rods). This is important there are not 4 rods, they are four z belts.