Inconsistent layers ech every 4mm with belted Z - V-Minion | TicTac Custom

Hi 3d printer owners, I got a weird issue on my custom V-minion printer. Already built belted Z, double mgn12 rails and its moving smoothly by hand. Any suggestion about this?

What I have done:

PID everything several times..

Rebuilt everything and make sure frame is squared

Change differences type of extruders

Change new TZ 2.0 Hotend

Change all Z pulleys and bearings

Nothing can solve it, Im really stuck now. Thanks
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