Summary

This bowl uses the same 5-sided squircle shape as https://www.thingiverse.com/thing:3047912, but I augmented it by morphing an array of square diamond shaped bumps on the outside. The design required very limited negative curvature because too much of that results in the bottom surface of the diamonds requiring support to print, and I don't design parts that require supports.

This part printed in slightly less than 22 1/2 hours using a print speed of 90 mm/sec and layer height of 0.100 mm.

PS: My filament reel got stuck near the end of the print which is why the tops of the diamonds look the way they do. Needless to say the STL file is OK.