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Ring. // The OpenSCAD default. // go positive if you are using Eurorack thickness = 2; panelHp=6; holeCount=4; holeWidth = 5.08; // 5.08, must explicitly account for squishing // middle-bottom h rib h_wall(h=1.6, l=right_rib_x); // bottom horizontal rib // h_wall(h=4, l=right_rib_x); // middle-bottom h rib // bottom horizontal rib // bottom horizontal rib // h_wall(h=1.6, l=right_rib_x); // middle 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 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 top knobs top_row = height - hole_dist_top); cylinder(r=hole_r, h=thickness*2); echo("Putting a hole for mounting screw: ISO 1481-ST 2.2x4.5 C or ISO 7049-ST 2.2x4.5 C (http://www.fasteners.eu/standards/ISO/7049/) || order number: 1843855 8A 160V Generic Phoenix Contact connector footprint.

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