Z banding on delta ???

Hello,

i have a problem that occured a few days ago... a terrible z banding in prints .

I use a rostock 3d delta printer,... i tuned my PID settings, checked all mechanical parts, no overextruding, i checked the X Y steps and i have no idea what it could be please help me out

The lines are consistent .... with a thickness of 0.6 mm , you can see the problem in the picture attached

Thank you very much

I can't see the image. If I follow the link, it want me to log on to Microsoft. Post it on a public file sharing site instead.

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Large delta printer [miscsolutions.wordpress.com], E3D tool changer, Robotdigg SCARA printer, Crane Quad and Ormerod

Disclosure: I design Duet electronics and work on RepRapFirmware, [duet3d.com].

Sorry about that, i uploaded the photo again .... any help will be appreciated