SquircleBowl2 is a variation on the geometry of https://pinshape.com/items/467.... I reduced the number of sides from 5 to 3, and changed the flat top edge to a rounded one.

A squircle is a polygon with curved sides and rounded corners. The name squircle comes from "squared circle." This part is formed from a series of squircled pentagons; there are 10 of them stacked vertically; all ten serve as the control curves for the loft shape that you see here. A short video is here: https://youtu.be/IXWByYuwEW8

This part printed in a bit more than 10 1/2 hours using a layer height of 0,200 mm and a print speed of 100 mm/sec. Note that this kind of part, regardless of the overall shape, is NOT WATERTIGHT and will LEAK if you put any sort of liquid in it. It is possible to make parts like this truly watertight, but doing that involves carefully using a nasty chemical that fuses the printed loops and layers together.