This is a very common problem. Apparently HP changed the roller because of this fault.
I've tried cleaning, I've tried making the roller rough. I tried to get HP to send me a new roller but they didn't even reply.
HP are a rubbish company who don't care at all about customers (and their printer software (bloatware) is even more rubbish).
BUT - the solution I found:
The spring that holds the roller down onto the paper is too weak. I bent the end of a straightened out paper clip into a small hook then made another hook-like bend a bit further up (but kept the rest of the clip to use like a handle). the length between the two hook parts is just under 1/2 inch. Don't cut it yet - buy you will need to when it's in place.
Hold the handle end (the bit at the bottom of this sketch) so you can fiddle about in the small space and don't loose the spring altogether.
Find the spring that fixes onto the roller gadget, it hooks onto the printer body. Hook the spring off the hole in the printer body, and then catch the second (double) hook of the paperclip onto the small printed circuit board just by the roller (most of the board is empty - so hook it to the left end of the board).
Then, when it's all in place cut the rest of the paperclip off.
You can see the double hook part once I'd cut off the "handle" piece in the photo:
and here you can see where the spring used to go, and where it fixes with the clip thingy I made.
Of course this is what I did (when I was about to throw the printer away so it was a last chance survival idea), if you loose the spring, stick it onto something that goes sparky-sparky or otherwise kill the machine or yourself I can't take responsibility!
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