Probably many of you are thinking about how cool is to have CNC plotter or 3D printer. There kits and ready printers available for reasonable price. But still they are pricy for hobby use. But nothing is lost you like to build stuff. Hobbyprojects.com posted his progress in building plotter where he wanted things to be cheap and simple. He’s build all part separately by finding simplest and cheapest solution to rising problems.
Some of his parts came from Epson printer. He also purchased used stepper motors from local junk store. The electronics part he built around PIC16F877 microcontroller. He built his own motor driver circuit out of discrete components, but it seems that results aren’t as good as it would be with specialized chips like Allegro A3984. Connection to PC was implemented via optocouplers. Several LEDs indicate each motor activity.