This is a simple light cover that fits over standard fittings designed for DIY covers and lamp shades. It was specifically designed for the wall-mounted lights on the outside of my house, but you could use it in other ways.
Easy to 3D print without support material, I used PETG for these to be suitable for outdoor use. Printed on a Prusa MK3S+.
Full details on my blog https://edditiveblog.wordpress.com/2021/03/21/3d-printed-outdoor-lights-in-petg/
The author hasn't provided the model origin yet.