I would suggest perusing a few robotics related books first.
Books like "Robot Builder's Bonanza", "Building Robot Drive Trains",
"Mobile Robots", "Build Your Own Robot",
"Absolute Biginner's Guide to Building Robots", "RobotBuilder's Sourcebook",
"Robot Building for Dummies", et cetera.
That would gie you a good start, plus give you lots of ideas too.
You need two identical printers to take apart. As to what parts you need, it
depends on your imagination, skill, and abilities when it comes to what is
useable out of a pair of printers.
I don't think anyone can tell you what parts to use as all the printers are
different and have different parts.
The basic technique is to take apart a couple of printers and lay out all
the parts and see what you can put together for a robot to use.
The most practical method of using a PC to run a robot, is to have the PC
communicate with a microcontroller, which serves as the I/O processor for
Basically, all the serial motor controllers do exactly this anyway.
So learning how to program microcontollers (just pick the one you like the
most, they are all about more or less equal), and learn how to program it.
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