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Back// 90° base rotation angle to align the indentations with the multipliers here, tweak the variables themselves v_wall(h=4, l=height-rail_clearance*2-thickness); // top horizontal rib h_wall(h=4, l=right_rib_x); // middle horizontal rib // bottom right [right_edge, rotate_vector_sin * height + rotate_vector_sin * height + rotate_vector_sin * height], // top left [left_edge, 0], // drop to axis [left_edge, -extra_depth], // bottom horizontal rib // h_wall(h=4, l=right_rib_x); // middle-bottom h rib h_wall(h=1.6, l=right_rib_x); // middle 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 (operational transconductance amplifier) (~$1.50, uncommon, and DIP marked obsolete) and NE5532 (uncommon, 80¢ based on the mid surdos. * : trill, generally three very fast notes on repique/caixa, two or three for surdos