Bad Printing Quality May Not Due To Clogging

While having the ability to refill an ink cartridge and enjoy almost-free prints, it's frustrating when your refill isn't working correctly.  If a printer is printing, but the output is blank or has poor image quality, it is often due to clogging. Many articles are showing how to unclog a particular printer.  Therefore, many people identify the problem to be clogging and start unclogging the printhead. The more they try, the worse the problem gets.
Not all bad prints are caused by clogging.  An aging printhead may cause the problem. If you're in this situation, there are steps you can take to identify the problem.

• Clogging creates stripes evenly across the page.

An aging printhead works sometimes but not all the time.  When a printhead ages, it starts to form bigger bubbles instead of an array of smaller and more precise bubbles.

• A dying printhead creates unevenly "superbubbles."

On the top, there was a superbubble created, but the print head was able to recover. Then the printhead formed another superbubble and stopped the ink flow.

Wide-format inkjet printers are "bubble jets."  Inside each nozzle is a tiny heating element. When an electrical impulse reaches this heating element, it vaporizes a small amount of ink. Similar to water boiling in a saucepan, the vapor bubbles out of the nozzle and places a droplet of ink on the page as the printhead passes across the surface.
A clogged printhead has a distinctive pattern.  Please see these three pictures. A regular clog is consistent across the page, because of the printhead functions but is blocked due to debris or an air bubble.
Therefore, if you meet the problem that your printer head doesn't work, try to figure out how it appears.