I am very cranked at my newly purchased HP printer because, unlike the
older one (no longer on the market), this one uses the HP 90-series
cartridges, which are deliberately designed to frustrate refilling.
To add insult to injury, the retail price of the genuine HP cartridge
has risen by about $9 in six months! This makes them very expensive
for me.
Apparently the cartridge can be reloaded with (non-HP) ink, but the ink
level indicator - including the low ink warning - won't work because
the microchip in the cartridges rachets downward and won't (unliker
earlier HP cartridges) reset for refilling. But I have had mixed
results with attempts to refill; sometimes the refilled cart simply
won't print even if it's soaked in ink - I suspect (but some other had
denied) that the microchip in the cartridge not only rachets downward
but when it says the cartridge is empty the printer either something
inside the cartridge shuts off the flow or the printer won't even try
to suck the ink out of the cartridge.
I recently had a tech problem (unrelated to ink cartridges) with my HP
printer and e-mailed the HP service .... and got conflicting and,
worse, utterly unhelpful responses. Well, at least they responded.
I recently sent off for a half-dozen "refurbished" cartridges,
something I haven't done before. I don't know if, or how well, they'll
work. If they don't satisfy, I might make a point of getting a
different brand of printer - one more congenial to ink refills (people
have recommended Canon for that purpose).
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