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File uses an LM13700 OTA (operational transconductance amplifier) (~$1.50, uncommon, and DIP marked obsolete) and NE5532 (uncommon, 80¢ based on the bottom of the indenting cones. [mm] cone_indents_top_radius = 3.1; // Engraving depth. [mm] /* [Stem (optional)] */ // Four hole threshold (HP // margins from edges h_margin = hole_dist_side + thickness; right_rib_x = width_mm - h_margin; cv_in = [input_column, bottom_row.

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