This is a hanging frag rack which I designed for larger tanks with thicker glass.  It can has 36 openings however the total of frags it can hold will depend on the size of the plugs used.  The frag platform has a raised edge for those frags that dont have the plug.  You can just lay your frags on the shelf as shown in the picture.  Its a 3 piece design and should be glued together.  Printed in ABS as shown in the picture.  Scale up as necessary.  Make sure to print at least 50% infill.