Andrew Mott-3D printable Keeper for CBreeze Model D+
Notice the retying of the cord under the front 'bridges'.
Detail of going outside the 'bridge' using 2 sided tape.
Some 2 sided tape can hold things in place if you want to go outside the cage edges.
Want more Airflow? One solution is to install a more open grating material, commonly known as "gutter guard".
(Photos courtesy of John Harvey)