Lego-compatible Pen Holder
Description
This Gravity-Fed Pen Holder Facilitates Using A Lego Robot Like A [Scribbler](Http://Www.Parallax.Com/Tabid/455/Default.Aspx) Robot -- As A [Mindstorms](Http://Mindstorms.Lego.Com/En-Us/Default.Aspx)-Programmable Pen Plotter.
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