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Of indentations, you way want to create a D-shaped hole, set this value to zero. // Length of the rail + a safety margin // margins from edges h_margin = thickness*2; v_margin = hole_dist_top*2 + thickness; working_height = height - v_margin*2 - title_font_size; working_increment = working_height / (8+tolerance/3); // generally-useful.

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