Andy - there are currently some reliable vendors with bulk refill inks that
they claim are formulated for the 4200. Until compatable carts become
available, you can refill. Quite easy to do and even cheaper than
compatable carts. You will get a series of messages when the printer reads
the chip as being empty, even though you have refilled the cart. You can
still print OK. There may be an issue with the warranty on the printer as
the printer "thinks" that you have run the cart dry and are continuing to
print - a sure way to risk burning out a Canon printhead. In the meanwhile,
if you decide not to refill, there is probably a market for empty chipped
carts for the new Canon printers.. Anyone who decides to refill these carts
will need backup carts and replacements when the ones they are refilling
stop functioning properly.
Don't confuse compatable with generic. Compatable products are formulated
specifically for a printer or series of printers that use the same ink and
generic inks claim to be suitable for use in several brands of printers.
Generic inks are generally to be avoided. AND - you already know to
disregard the troll's comments on this issue. Smart man.