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BackFormatting col_left = thickness * 1.2; right_rib_x = width_mm - col_right + tolerance*4; // column from edge plus hole radius //calculated x value of exact middle of panel after deducting left/right sub-panels // top 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 a regular polygon. ≥30 means "round, using current quality setting". Stem_faces = 30; // Height of the Pelorinho