Epson WorkForce ST-M3000 Monochrome MFP Supertank Printer - Manual (Page 236)

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8. Wait for the ink to fill the tank. Do not squeeze the bottle. Ink flows into the tank and stops
automatically when the ink is filled to the upper line.
Note: If ink does not flow from the bottle, lift and reinsert the bottle.
9. When the ink tank is full, remove the ink bottle and securely close the ink tank cap.