Printer prints sporadically leaving gaps

[Shnapz]

I purchased this printer 1+ year ago, and used rarely. At some point I realized that it leaves gaps when printing like on pictures below. Cleaning/aligning does not help

 

 

[Anand_Andy]

Hi @Shnapz,

Welcome to the HP Support Community

I understand you are facing a print quality issue with your HP Smart Tank Plus 551 Wireless All-In-One printer. Not to worry I will help you to get a resolution to resolve the issue.

To assist better:

• Are you using genuine HP ink cartridges?
• Does the copy print out the same way? 
• What's the application you are trying to print from? 
• What version of iOS is running on your device?
• Have you tried printing from a different application or device? 

While you respond to that, let's refer to this document with steps to fix the " Print Quality Issues" issue applicable to your printer -  Print Quality Issues

 Also, try updating the firmware - HP Printers - Updating or Upgrading Printer Firmware & Update software on iOS

Hope this helps! Keep me posted. 

Please click “Accepted Solution” if you feel my post solved your issue, it will help others find the solution. Click the “Kudos/Thumbs Up" on the bottom right to say “Thanks” for helping!