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Ridges around the top surface of the flat side (in mm). If you want a shaft, set this to zero. ShaftLength = 0; right_rib_x = width_mm - right_rib_thickness; // projection: make a 2d version v_wall(h=4, l=height-rail_clearance*2, th=right_rib_thickness); // top right [left_edge + height * rotate_vector_cos, rotate_vector_sin * height], // top right [left_edge + height * rotate_vector_cos; points = [ [left_edge, rotate_vector_cos * rail_depth.

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