Do you like the original Prusa design, but the last know of theirs just won't cut it with the flan top surface? Here is the same thing but with a hollow as in the previous design. Does this print well? Not so much: you need support because of how the original part is designed. If you want a thing that prints better — search one here on PrusaPrinters. There are many similar designs that you can try out.
The author remixed this model.