Hexagonal, half-hex and third-hex bowls with thin walls to make best use of filament and a thick rim for rigidity.
They tessellate satisfyingly in a range of patterns.
I printed in PETG but PLA should work fine. The thin walls were designed for 0.2mm layer height to avoid gap fill.
Concentric infill gives a nice hex pattern in the base.
If you're feeling fancy, you can use a height-range modifier to set the range 14mm+ to 0.1mm layer height; that gives a smoother top rim. This is totally optional.
The attached gcode and 3mf is for one full hex, two half-hexes and 3 third-hexes.
The author hasn't provided the model origin yet.