This is the plotter from the Ultimate Builders Set with a few modifications.
About this creation
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This is the plotter built from the Ultimate Builders Set expansion for the Mindstorms Robotics Inventon System (RIS). Most of the beams and connectors used are those from an NXT set so they will appear in different colors from the original design. I'm using a 9V AC Adapter to keep the RCX powered while providing higher voltage so the plotter works faster and more effectively. I've set it up so it uses a light sensor to know when there is paper present and a touch sensor is used to indicate when to begin plotting.