I scoured Printables looking for vases like that, with very simple shapes but which looks surprising when used, without finding what I really wanted, so I did it.
It's a 60*45mm rectangle with a 70mm extrusion with a 30° taper angle then finally mirrored and laid down on one side :'3
The gcode file provided is pretty optimised (in print time) and watertight, but feel free to adapt the settings I used:
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The author marked this model as their own original creation.