Just a simple x/y-axis machine with a pen built with lego and two servos. It is controlled with a joystick; i tried some program i found to make it draw gcode but it did not work. The controller is ... guess what... an Arduino! :D The lego gears were simply glued onto the servo and fixed with a screw. The code is really straightforward just reading the joystick pot value and ouputting the PWM for the servos.