Vertical banding on X

[celulari]

Howdy

I have my trusty Voron 2.4 r2, with CNC tap, Dragon hotend and Galileo V2E with a weird issue.

I'm experiencing vertical bands on X. My belts are tensioned equal but I don't have an absolute measurement of the belt tension, just not too loose, not too tight.

I've attached some images of the issue. Pls don't mind the stringiness, it's my not so dry TPU with a LOT of retractions and z-hop.

I'm suspecting bad pulleys on X, but it's just a shot in the dark

 

Thanks for any help

[Dirk]

I have never had this problem. But I have always kept in mind to read this page thoroughly whenever I would run into one.

I would definitely get a resonance tester to see if that gives anything.

[claudermilk]

I was going to link the exact same page as @Dirk. That looks like classic VFA issues.