This is just an attempt to help protect the LiDAR sensor dome from getting scratched. I made this a one piece design after some request, The picture is of my original 2 piece design because I never got around to taking an updated picture.  I printed mine in ABS plastic, you could also use PETG. I wouldn't recommend using PLA just due to the strength and UV resistant issues.  You can just press fit into the top groves around the LiDAR sensor for a friction fit or use some CA glue to more permanently.