Open the maintenance box cover. Pull out the pad. Wear gloves. Squeeze the ink out into a bucket. Let it dry in the sun for 24 hours. Reinsert. Option B (Cheap): Buy a generic maintenance box for the M2120 on Amazon or eBay ($10–$15). Replace the old one.
After approximately 8,000 to 15,000 pages (or roughly 1-2 years of heavy use), the counter hits a hard limit. The printer displays: Epson M2120 Resetter -FREE-
"Connection error: USB not found." Solution: Disable Wi-Fi on your printer. Use only USB. Go to Windows Device Manager -> Printers -> Epson M2120 -> Ensure it shows "USB Printing Support." Open the maintenance box cover