When I order Domino's pizza, I normally order enough for leftovers, and so I end up putting the sauces in the refrigerator. To keep them fresh and prevent them from spilling, I made these simple lids in PrusaSlicer. It's not water tight, but close (i.e. vigorously shaking it full of water, just a few small drops came out.)
I printed with PLA 0.25mm layer height with default DRAFT settings, and it came out nicely.
The author hasn't provided the model origin yet.