1.Punch. Use a punch cone to align the air hole at the top of the ink cartridge, and rotate it to punch to the appropriate depth. This is the ink filling port.

2. Ink filling. Remove the rubber cap on the ink cartridge and insert the mouth of the ink cartridge into the ink filling port at the top of the ink cartridge.

3. Processing. Seal the ink filling port with transparent tape and wipe the remaining ink on the ink cartridge with a paper towel. Place a paper towel under the ink outlet and let it stand for about 5 minutes. Under the capillary action of the paper towel, wait for the ink to precipitate from the ink outlet, and then install it for use.