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= -rotate_vector_sin * rail_depth; right_edge = height * rotate_vector_cos; [left_edge, rotate_vector_cos * rail_depth], // top horizontal rib h_wall(h=1.6, l=right_rib_x); // bottom right [right_edge, rotate_vector_sin * height], // top left [left_edge, 0], // drop to axis [left_edge, -extra_depth], // bottom horizontal rib // h_wall(h=1.6, 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 https://drive.google.com/drive/folders/156nn9rClRLJplS4M46s56-Pibi86Z-Kp for schematics and .ino file uses an LM13700 OTA.

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