This week I finished the new arm drawings, and Mr. Bahn used the XCarve at his house to carve them.  I also began testing a marker lifting mechanism based on magnetism.  The marker will be mounted on a small piece of wood at the end of the arm.  It will normally rest on the paper due to gravity, and to lift it, a current will pass through a coil of wire.  This will create a magnetic field and interact with a magnet on the small piece of wood, tilting it up and lifting the marker off the paper.  A rough sketch of the design can be seen below.