Simple Parametric Cap / Lid

I had an old square USB battery charger that didn't work anymore.  I removed the internals and was left with a nice casing.  I made this frame (PETG) that mounted on the top and made a lid/plug (FLEX/TPU).  The frame mounts with existing screws.  No supports are necessary.

With the parametric FreeCAD file provided, this design can be adapted to other situations where a cover or lid is needed.