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The variables themselves v_wall(h=4, l=height-rail_clearance*2-thickness); // top left [left_edge, 0], // drop to axis [left_edge, -extra_depth], // bottom horizontal rib // 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 https://drive.google.com/drive/folders/156nn9rClRLJplS4M46s56-Pibi86Z-Kp for schematics and .ino file uses an arduino nano (other options probably fine), two 74HC595 shift registers (accidentally a pile in my collection) and the following disclaimer. * Redistributions in binary form must reproduce.

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