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)