My printer just started creating a wavy crease on the paper today. The first couple of prints were fine, then bam.. this.
It's not a paper settings issue (I've tried several)
I've started the printer - no difference.
I've used 2 different paper types - same on both.
It happens if I print colour, or Black & white. or as you see below. neither.
Below is a printing of a cleaning sheet. The line is very feint at the top where it just runs the paper through before it does the cleaning operation on the last 20% of the page - here the crease is significantly worse.
I did a stop test and it seems fine prior to going through the fuser.
I checked the rollers and they seem fine.
It was ordered August 10 2018 directly from HP so it's still under warranty.