When an  Epson  printer is not printing black after a refill, several potential issues could be causing the problem. To know more about epson printer not printing black color after refill. Here's a checklist to troubleshoot and resolve the issue:

Air Bubbles in the Cartridge:

After refilling, air bubbles can sometimes get trapped in the  ink cartridge. This can prevent ink from flowing properly. To resolve this, you can try gently shaking the cartridge or performing a cleaning cycle.
Clogged Printhead:

The printhead may be clogged, especially if the printer has been idle for a while. Run the printhead cleaning utility provided by the  printer software. You may need to do this several times to clear any clogs.
Improper Refill Procedure:

Ensure that the cartridge was refilled correctly. Sometimes, the cartridge may not be refilled properly, leading to airlocks or insufficient  ink flow. Double-check the refill instructions and try refilling again if necessary.
Low-Quality  Ink:

The quality of the  ink used for refilling can affect print quality. Ensure you are using high-quality, compatible ink for your specific  Epson printer model.
Resetting the Ink Cartridge Chip:

Some Epson cartridges have a chip that tracks ink levels. After refilling, the chip might still indicate that the cartridge is empty. You might need to reset the chip using a chip resetter tool.
 Printer Settings:

Verify that the printer settings are correctly configured to use the black ink. Sometimes, the printer may be set to use only color  inks.
Physical Obstructions:

Inspect the cartridge and the  printer for any physical obstructions or issues. Make sure the cartridge is seated correctly in the  printer.
Step-by-Step Troubleshooting:
Run a Nozzle Check:

Use the printer software to run a nozzle check. This will print a test page that shows if any of the nozzles are clogged.
Perform Printhead Cleaning:

Run the printhead cleaning utility from the printer software. You might need to do this multiple times.
Check for Air Bubbles:

If air bubbles are suspected, remove the cartridge and gently tap it to release any trapped air.
Reset the Cartridge Chip:

Use a chip resetter tool to reset the  ink level indicator on the cartridge.
Use High-Quality  Ink:

Ensure that you are using a reputable brand of  ink compatible with your  Epson  printer.
Check Printer Settings:

Go to the printer settings on your computer and make sure the printer is set to use black ink. To know more about why is my epson printer not printing anything on paper.
If none of these steps resolve the issue, the printhead might be permanently clogged or damaged, which might require professional servicing or replacement of the printhead or printer.