Inground swimming pool - pole covers

These cover the holes in your deck where your pool stairs and ladder go. Put them in during fall and keep the crap out of them. Picture shows prototype and .stl have beveled edge so you won't catch your foot on it. If you print these in low quality with 2 shells and a low fill you can just throw these away at the beggining of the season. I don't think PLA would be good for this.