This is a clip that attaches to the bottom of a DELL monitor with 4 P1P pegboard style hooks which are upside down. You can then insert a sheet of P1P pegboard into it and hang anything with the hooks from the other side. I recommend printing two of them and putting the lattice between them, as it tends to sag to one side if it's unevenly distributed.
The author marked this model as their own original creation.