Plastic Storage Shelf Cap

Replacement cap for those 5-tier plastic resin shelves you can buy from hardware stores. I think mine is from Canadian tire, not sure if it will fit other ones. The hole diameter is about 41mm, you can probable just scale the model uniformly up or down if your hole is a bit different.

It's screwed onto a wooden block in one of the pictures because I was modifying the shelf parts to make a bed platform for car sleeping, obviously your use case may vary.