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BackH=10, $fn=3, center=true); for (z = [0 : sphere_indents_count]) { z_position = height - v_margin - title_font_size*1.5; working_height = height - v_margin; working_increment = working_height / (8+tolerance/3); // generally-useful spacing amount for vertical columns of stuff working_increment = (working_height-v_margin+thickness) / (9); // generally-useful spacing amount for vertical columns of stuff right_rib_thickness = 2; // plastic walls are 2mm clf_shaft_diameter = 6.3; // the larger diameter of the indenting spheres, measured from the centerline of the Pelorinho