I took an epson printer apart just 2 days ago. It had 2 identical stepper motors that i salvaged and i also kept the power converter inside.
I didnt bother with the electronic components because theyre not really that expensive and the whole process of de soldering is annoying and also trying to resolder something with a very short leg length is also not the easiest thing in the world.
I plan on making my own stepper motor driver with mcu - mosfets. Although I probably wont use them for a while, they are going to be too big for anything i do in the near future.
I also kept a ir receiver/detector that i found inside of it, I presume it is to detect wether paper has been fed or not but will work well for an encoder reader.
I also kept the gears but i'll probably never use them since gear kits are usually a lot easier to work with