Sean Longfellow's "Connect The Dots"
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"Connect The Dots"
"Connect the dots" does exactly what it says:  it plots the points and then returns to the first dot and connects the consecutive dots.
There are two modes in this project:  one is prefabricated designs like the TWP symbol and other mode does various designs.  It does this using a horizontal print mech with a sharpie marker mounted on to the carriage of the print mechanism.  The marker moves vertically using a solenoid and a spring.
It moves up and down on the pulley using a motor, belt and pulley which is connected to the gantry.