@neverpoint Hi: Most of the spline commands can generate a face when they are closed: [image: 1755244489901-spline_face.gif] If this is not the case, select the spline and type in the Ruby console: spline=Sketchup.active_model.selection[0] # will return something like => #<Sketchup::Edge:0x000001a70b1968e8> face = spline.find_faces # will return something like => 1 (1 being the number of face(s) created or simply redraw a segment of the spline and the face will also be created. [image: 1755244901974-spline_line.gif] Regards