Remember the screen printer [0]? It had a spinning drum with metal fingers that dragged across a curved sheet of aluminized paper. Sparks would remove the alumi

Remember the screen printer [0]? It had a spinning drum with metal fingers that dragged across a curved sheet of aluminized paper. Sparks would remove the aluminum, leaving the underlying black paper visible. [0]: http://www.trs-80.org/trs-80-screen-printer/ http://www.trs-80.org/trs-80-screen-printer/