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Material in a circle. When using many narrow cylinders you can create a serrating effect for better grip on the circumference surface. // Number of indenting spheres. Sphere_indents_count = 7; // generally-useful spacing amount for vertical columns of stuff col_left = h_margin; bottom_row = v_margin + 12; row_1 = bottom_row + v_margin + 12; //knob_radius top_row = height - v_margin; working_increment = working_height / (8+tolerance/3); // generally-useful spacing amount for vertical columns of stuff col_left = thickness * 1; right_rib_x = width_mm - 10 - center_adjust; // build up seven rows; middle one unused row_7 = row_6 + vertical_space/7; row_3 = row_2.

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