This is a clip to attach a paper to the monitor.
I have attached the freecad file for customization. Open the file in freecad (https://www.freecadweb.org) and open the Spreadsheet. Change monitor_angle and monitor_thickness according to your monitor frame. Select and activate (space bar) the monitorclip001 refine-shape object. Switch to the Mesh Design workbench and got to "Meshes -> Create Mesh from shape". Select the Mesh and export to stl.
After printing fill the groove with hot glue.
The author hasn't provided the model origin yet.