Purpose: To help stop poop from flinging out of the poop chute on to the print bed and messing up the prints. It also adds a nice decorative look to the top of the chute.
Remix: I wanted to match some of the hexagon theming I had on one of my printers so I re-remixed AstraCD's model to add this look. To improve the model, i took the tab from woozle's wiper model so it could be secured down with one of the screws from the top of the chute. This should help hold it down in case, for some reason, the the material softens over time and loosens up from its press fit. I feel better knowing its secured down with a screw regardless.
That being said, you'll want to make sure you use something heat resistant like PETG / ABS / ASA to resist the higher temps inside.