Insert for the affordable rock tumbler

I built the Affordable Rock Tumbler of onkelgeorg, but wasn't able to get hold of the right components for the drum. I think I nailed the drum itself, but the lids that were offered were not adequate and I foresaw a lot of problems when this didn't fit properly.

Because an insert had to be printed anyhow, I decided to also print the lid.
There is of course much room for improvement, especially in making it easier to open.
I also wanted to make it quick to print, although it took many hours