The basis for this part came from posting I found in the Grasshopper online forum. 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.

This part printed in a bit more than 17 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.