From my experiences with printer tear downs (100+) I've learned that it depends.
Cheap loss leader consumer grade inkjet printers aren't a great place to find precise parts. In fact, they work adequately using imprecise parts by design. That's one reason they're so cheap.
Business machines, on the hand, often have very precise parts. We're talking about Xerox color printers/copiers/multifunctional machines designed to serve 100's of people per day, operating continuously for 10+ hours per day.
A great place to find these beasts is through surplus auctions.
If you can get them cheap (under $150) you'll find a dozen or more very precise and sometimes hardened rods. But if that's all you need, you can probably find cheaper options.
Those machines have a lot of goodies though. Rotary encoders, servo motors, stepper motors, bearings, gears (delrin, brass, magnesium), belts, rubber wheels. Great for making robots and more.
Posted by: Michael Buffington <michael.buffington@gmail.com>
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