20150312-01.skp (29.3 KB) As an experiment I extruded a semi-circular groove along an edge of a board-like object. However, when I extruded a similar groove up one of the perpendicular edges the groove extrusion is stopped at bottom of the first groove; in other words it won’t cut through. Is there a way to cut completely through, so that the grooves form one complete groove going around the edges?