I have a Canon BJC 4300 printer; it has aways worked well, even though I have refilled the big black ink tank several times inthe past. I hate to junk the printer for I do a lot of black and white printing, and I do not know of any other ink tank (or printer) that holds 30 cc of black ink. Besides I paid for the ink refills; had to buy a pint of it.
Today, however, it printed clearly and legibly but only faintly. This was new. I was able to add 20 cc of ink; it will hold 30. It made no difference. Even if I print a Comic sans MS page (a thick-letter font) it is still faint. I shook it (with the area where the ink comes out in the down position) 20-30 times, hard. No difference. I cleaned the head physically--it was damn clean anyway--and ran the clean operation twice. I wait 20 minutes (tank in printer in its home position.) No difference. At times in the past shaking it worked well for 20 or so pages.
A new tank costs about $30.
I'd appreciate suggestions to avoid spending that $30.