Resolve Windows 10 related issues for your HP computers or printers by HP Windows 10 Support Center
Welcome to HP Forums and Thanks for the post.
I understand that you are facing a print quality issue with the sprocket, is that right?
Kudos to you for trying to troubleshoot the issue on your own.
I will be glad to assist you.
As you have already tried a lot of steps on your own, request you refer to this HP Article and try the steps you might have missed.
If the issue persists, please contact our phone support team to check the service options available for the sprocket.
Keep me posted.
The_Fossette I am an HP Employee
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