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// drop to axis [left_edge, -extra_depth], // bottom horizontal rib h_wall(h=4, l=right_rib_x); } module rail(height) { difference() { difference() { difference() { linear_extrude(height) railProfile(); railSupportCavity(height); } } if ($rel[0]=='#' || $rel[0]=='?') { return 2; .

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