This is an easy printer made from parts of a cd reader.
It prints using a regular marker of any color.
Maybe it doesn't have a great resolution but this is a project that I really wanted to do.
Step 1: Materials
The most important is the cd reader, also a dvd reader will work.
Try to find one with a bipolar motor for the laser, mine used a regular dc motor and I changed it later for a stepper motor.
Also you will need another stepper motor with a rubber wheel and a wooden base.
Electronic stuff is detailed in other step.