StrikerRaiser

Hi guys, In some of my recent prints I've had some issues with interesting patterns coming in with the prints. Almost as if the layers don't fit flush with each other on each new layer. This has only been happening recently, so I was wondering if it was caused by a print setting or an issue with my printer (Ultimaker 2 Extended+). If any of you have tips on how to deal with this, I would be very interested in hearing it! From memory it was printing better than this not too long ago but I didn't use the printer for a couple months and its now doing this (It could even be filament for all I know). I look forward to hearing back! Cheers, Jonathan