4mm Z distance lines (compressed layer)

Although not so obvoius they are there at a fixed interval in Z.
I tried to recalculate from where this 4 mm comes from.
If I know it would be easy to solve πŸ˜€ .
Happens with all filaments also on long objects all around so it must be in the Z system.
Screws are checked and the regular 4 mm distance makes it repeatable and not random.
Vcore 300 with Ventermechs + Orbiter 2.0

Where to look first?

Paco
IMG_7512.JPG
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