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About 20mm in diameter at the first number in this measurement. KnobDiameter = 20; // Shape of top of the arrow. Scale([engraved_indicator_scale * 0.3, engraved_indicator_scale * 0.3]) union() { difference(){ color([.1,.1,.1]) panel(width); //module title(string, size=9, halign="center", font="Futura XBlk BT:style=Extra Black") { //} // draw panel, subtract holes // label the whole thing? // top/bottom ribs? // top horizontal rib h_wall(h=4, l=right_rib_x); // one more vertical to mount a circuit outside the full dev board (in some cases) Arduino + DAC https://www.youtube.com/watch?v=t3kUPjdiq0o for explainer.

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