1/4" thick sewing/quilter ruler holder

My mom is really into sewing & quilting. Like…really into it. She has quite a few sewing/quilting rulers that are a quarter inch thick, and she asked me to design & print something that would hold her rulers vertically, so this is it. It's roughly 10 inches wide and 13.5 inches long, and can hold 13 rulers. If you print it with both parts horizontal to the build plate (with support for the overhangs) the layer lines will be parallel to each other and cause the two pieces to interlock