I am trying a small 'cabinet' type cover..
The idea is to keep the servo dry (ish) and allow air to circulate..
So far, a 3D print has 'warped' and one made from (admittedly black) plasticard, has had the glued-joints fail..
I am thinking of trying a cast resin unit.. This might be a rabbit-hutch, initially!

Just to prove the concept..
PhilP