This is a quick print for a cover lid to Swedish style junction boxes (apparlåda).
Comes in two dimensions 100mm and 85mm diameter with quick hooks for 70mm rounded junction holes.
You don't need any screws for this solution since the lid has 2 "hooks" on itself so it should sit stable
on all/most boxes around.

All dimensions can easy be adapted using the VarSet-variables in the included FreeCad project file.