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+ 2 * shafthole_radius + 2 * nothing, shafthole_cutoff_arc_height + 2 * shafthole_radius + 2 * nothing; z_position = height - v_margin*2 - title_font_size; working_increment = (working_height-v_margin+thickness) / (9); // generally-useful spacing amount for vertical columns of stuff col_left = thickness + 6 + tolerance; rotate_vector_cos = 0.94; // 'x' of 20 degree rotation rotate_vector_sin = 0.34; // 'y' of rotation left_edge = -rotate_vector_sin * rail_depth; right_edge = height - v_margin - title_font; left_rib_x = thickness * 1; right_rib_x = width_mm - thickness*2; // draw a horizontal cylinder around the knob? Knurled.

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