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Action by the original version of the rail + a safety margin // margins from edges h_margin = hole_dist_side + thickness; working_height = height - v_margin; working_increment = working_height / 6; // generally-useful spacing amount for vertical columns of stuff col_left = h_margin; working_height = height - v_margin*2 - title_font_size*1.5; working_height = height - hole_dist_top); cube([flange, flange, h], center=true); if (RingMarkings>0.

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