A cover for your pool that prevents pool robots from getting stuck on the drain. When a robot hits the cover, it tips up and forces at least one track or wheel to get sufficient grip so that it does not high-center.

You can print in PLA or ABS. I use the clips to hold the parts together when using PLA, and Bolts for ABS. You can use either clips, tie-wraps or weights to hold it in place. I prefer using a ten pound weight I picked up from Amazon