Re: nozzle drying and clogging in ink-jet printers
I don't how you use your printer but if you have to stop to swap out ink when it becomes empty, then do so, NOW! If you wait you pay the price if taken too long. Most ink printers have "monitoring" to help in this regard, provided you don't mess-up or somehow short-chage it process, it makes good sense to change when it states so. You do have some ink available but to actually go until its out only stresses the printer's ink heads. Epson uses a "piezo" type inkhead and these aren't too good when they become clogged and may burnup. While Canon uses a "thermal" ink head, it usually burns-up if repeated printing with no ink as the ink is used to help cool the ink head. In either case, it just doesn't make good sense to repair these brands as "replacement cost" is more practical. HP and Lexmark(or similar) tend to be easy to fix as the "whole ink head" can exchanged during a low ink condition and thus remove itself from wear&tear of usage when the ink head remains and only the ink source is replaced.
Last, you should do a "proper shutdown" procedure using the printer's ON/OFF button rather than anything else so the printer can properly park to help keep the ink head "apped", when not in use. Also, printing on a regular basis helps too to "rejuvitate" the ink canals and thus keep from drying out, just turning it on but a short printout is better.
good luck -----Willy
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