This model is a cover/pusher for motion sensor light switch made by ECOELER.  Includes scad for adapting to yours. The bottom prongs snapped off of mine.  This doesn't match the curve of the old one, but it fits nicely as is.

I printed at 3 walls, with 15% infill.  I used tree supports for the top tabs, but it probably wasn't necessary.

The scad has almost everything parameterized so if you don't have this same brand it should be easy enough to adapt.