I have a several-year-old HP Deskjet 812C that's seen very heavy use since the start of school. Though it's not a particularly fast printer, I like it because it's reasonably cheap to run (the cartridges hold a lot of ink and you can buy third party ones) and HP's printer driver will work over a network, so we can use it through the wireless network. (Note that the printer itself isn't network aware--we have a computer that acts as a print server--but HP didn't take steps to keep the driver from being network compatible, unlike with Coppertop's 5150 driver which seems to actively resist printing over our network setup.)
The problem is that the printer's slowly dying. The belt that drives the print head is disintegrating. Today, I nearly tossed the printer in recycling but ran a last-minute Internet search to see if a fix existed.
Turns out that disintigrating belts on these old printers are a common problem. There's a helpful thread here that discusses it. Even better, they offer a link to buy a replacement belt, which is great because HP's stopped offering that part. The $38 for belt, including shipping, is about what a cartridge costs, making it worth the attempt because otherwise I'd have to sell or recycle spare cartridges and have the extra headache of losing network printing. So I've placed the order. We'll see how well this replacement belt works.