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V+ (i.e. 6v) but many external clock sources cycle between 0v and 5v or even much less. - One idea: add a switch } else { rotate_extrude(convexity=10, $fn=fn4) polygon(points=[ [x0,y1],[x1,y1],[x2,y2],[x2,y3],[x1,y4],[x0,y4] ], paths.

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