Some time ago I gutted a couple of HP printers and salvaged a slew of these steppers and now I would like to use them to make a 3D printer. Problem is, I can't find any technical details on the motors themselves of the IC on them. They appear to be 3 phase and I assume the PCB on the back is some sort of on board drivers, hopefully negating the need for separate driver boards. The picture is taken from an eBay site selling the same things but lacking any tech details. Can anyone here help shed some light on this?
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