Are you loved to watch the robot doing the plotting works? If you do, then you must be interested in develop a NXT Pin-Plotter III! Before you’re getting excited with this project, you have to buy the NXT in the nearest local electronic store. Basically, the NXT is the combination of fixed base and a moving tool. On the moving tool part, there is a smaller moving tool, which it is used to move vertical on the main tool, and it’s the place, where the “pen” is mounted too! The “pen” is an axis ending with a needle (and the needle is the only non-LEGO part of this MOC!) By the way, you also need to glue the needle in an old 1×2 brick.