WHAT IS IT?
There're so many of these things. This is a round twist-top container. I made it to test my ability to manually create threads in CAD. They seem to work just fine.
NO ADDITIONAL HARDWARE NEEDED
MY PRINT SETTINGS
This thing can be printed however you like, really. To be sure the threads fit, I did 0.12mm layer height. 3 walls, 20% infill. Pretty standard stuff.
The author marked this model as their own original creation.